diff --git a/source/ada/lsp-ada_handlers-project_diagnostics.adb b/source/ada/lsp-ada_handlers-project_diagnostics.adb
index eefa239bd..57898092d 100644
--- a/source/ada/lsp-ada_handlers-project_diagnostics.adb
+++ b/source/ada/lsp-ada_handlers-project_diagnostics.adb
@@ -90,11 +90,7 @@ package body LSP.Ada_Handlers.Project_Diagnostics is
       ---------------------------------------
 
       procedure Create_Project_Loading_Diagnostic is
-         Project_File : GNATCOLL.VFS.Virtual_File renames
-           Self.Handler.Project_Status.Project_File;
-         URI          : constant LSP.Structures.DocumentUri :=
-           Self.Handler.To_URI (Project_File.Display_Full_Name);
-         Sloc         : constant LSP.Structures.A_Range :=
+         Sloc : constant LSP.Structures.A_Range :=
            (start  => (0, 0),
             an_end => (0, 0));
       begin
@@ -112,15 +108,24 @@ package body LSP.Ada_Handlers.Project_Diagnostics is
             Parent_Diagnostic.message := Project_Loading_Status_Messages
               (Self.Last_Status);
          else
-            Parent_Diagnostic.message := "Project Problems";
-            Parent_Diagnostic.relatedInformation.Append
-              (LSP .Structures.DiagnosticRelatedInformation'
-                 (location => LSP.Structures.Location'
-                      (uri     => URI,
-                       a_range => Sloc,
-                       others  => <>),
-                  message  => Project_Loading_Status_Messages
-                    (Self.Last_Status)));
+            declare
+               Project_File : GNATCOLL.VFS.Virtual_File renames
+                  Self.Handler.Project_Status.Project_File;
+               URI          : constant LSP.Structures.DocumentUri :=
+                  Self.Handler.To_URI
+                    (Project_File.Display_Full_Name);
+            begin
+               Parent_Diagnostic.message := "Project Problems";
+               Parent_Diagnostic.relatedInformation.Append
+                 (LSP.Structures.DiagnosticRelatedInformation'
+                    (location =>
+                       LSP.Structures.Location'
+                         (uri    => URI, a_range => Sloc,
+                          others => <>),
+                     message  =>
+                       Project_Loading_Status_Messages
+                         (Self.Last_Status)));
+            end;
          end if;
       end Create_Project_Loading_Diagnostic;
 
diff --git a/testsuite/ada_lsp/project_config.multiple_project_diagnostics/a.gpr b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/a.gpr
new file mode 100644
index 000000000..77580cb9e
--- /dev/null
+++ b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/a.gpr
@@ -0,0 +1,2 @@
+project A is
+end A;
diff --git a/testsuite/ada_lsp/project_config.multiple_project_diagnostics/b.gpr b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/b.gpr
new file mode 100644
index 000000000..a97f22fac
--- /dev/null
+++ b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/b.gpr
@@ -0,0 +1,2 @@
+project B is
+end B;
\ No newline at end of file
diff --git a/testsuite/ada_lsp/project_config.multiple_project_diagnostics/main.adb b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/main.adb
new file mode 100644
index 000000000..e0d8401fa
--- /dev/null
+++ b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/main.adb
@@ -0,0 +1,4 @@
+procedure Main is
+begin
+   null;
+end Main;
diff --git a/testsuite/ada_lsp/project_config.multiple_project_diagnostics/test.json b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/test.json
new file mode 100644
index 000000000..e966530d3
--- /dev/null
+++ b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/test.json
@@ -0,0 +1,231 @@
+[
+   {
+      "comment": [
+         "Test the project diagnostics when we have several .gpr files in the ",
+         "root directory, without having set the 'ada.projectFile' setting.",
+         "It also checks that we propose a quickfix to set 'ada.projectFile'."
+      ]
+   },
+   {
+      "start": {
+         "cmd": ["${ALS}"]
+      }
+   },
+   {
+      "send": {
+         "request": {
+            "jsonrpc": "2.0",
+            "id": 1,
+            "method": "initialize",
+            "params": {
+               "rootUri": "$URI{.}",
+               "capabilities": {}
+            }
+         },
+         "wait": [
+            {
+               "id": 1,
+               "result": {
+                  "capabilities": {
+                     "executeCommandProvider": {
+                        "commands": ["<HAS>", "als-refactor-add-parameters"]
+                     }
+                  }
+               }
+            }
+         ]
+      }
+   },
+   {
+      "send": {
+         "request": {
+            "jsonrpc": "2.0",
+            "method": "initialized",
+            "params": {}
+         },
+         "wait": []
+      }
+   },
+   {
+      "send": {
+         "request": {
+            "jsonrpc": "2.0",
+            "method": "textDocument/didOpen",
+            "params": {
+               "textDocument": {
+                  "uri": "$URI{main.adb}",
+                  "languageId": "ada",
+                  "version": 1,
+                  "text": "procedure Main is\nbegin\n   null;\nend Main;\n"
+               }
+            }
+         },
+         "wait": []
+      }
+   },
+   {
+      "send": {
+         "request": {
+            "jsonrpc": "2.0",
+            "id": 2,
+            "method": "workspace/executeCommand",
+            "params": {
+               "command": "als-source-dirs"
+            }
+         },
+         "wait": [
+            {
+               "method": "textDocument/publishDiagnostics",
+               "params": {
+                  "uri": "$URI{main.adb}",
+                  "diagnostics": [
+                     {
+                        "range": {
+                           "start": {
+                              "line": 0,
+                              "character": 0
+                           },
+                           "end": {
+                              "line": 0,
+                              "character": 0
+                           }
+                        },
+                        "severity": 1,
+                        "source": "project",
+                        "message": "No project was loaded, because more than one project file has been found in the root directory. Please change configuration to point a correct project file."
+                     }
+                  ]
+               }
+            }
+         ]
+      }
+   },
+   {
+      "send": {
+         "request": {
+            "jsonrpc": "2.0",
+            "id": 6,
+            "method": "textDocument/codeAction",
+            "params": {
+               "textDocument": {
+                  "uri": "$URI{main.adb}"
+               },
+               "range": {
+                  "start": {
+                     "line": 0,
+                     "character": 0
+                  },
+                  "end": {
+                     "line": 0,
+                     "character": 0
+                  }
+               },
+               "context": {
+                  "diagnostics": [
+                     {
+                        "range": {
+                           "start": {
+                              "line": 0,
+                              "character": 0
+                           },
+                           "end": {
+                              "line": 0,
+                              "character": 0
+                           }
+                        },
+                        "message": "No project was loaded, because more than one project file has been found in the root directory. Please change configuration to point a correct project file.",
+                        "severity": 1,
+                        "source": "project"
+                     }
+                  ],
+                  "triggerKind": 2
+               }
+            }
+         },
+         "wait": []
+      }
+   },
+   {
+      "send": {
+         "request": {
+            "jsonrpc": "2.0",
+            "id": 13,
+            "method": "textDocument/codeAction",
+            "params": {
+               "textDocument": {
+                  "uri": "$URI{main.adb}"
+               },
+               "range": {
+                  "start": {
+                     "line": 0,
+                     "character": 0
+                  },
+                  "end": {
+                     "line": 0,
+                     "character": 0
+                  }
+               },
+               "context": {
+                  "diagnostics": [
+                     {
+                        "range": {
+                           "start": {
+                              "line": 0,
+                              "character": 0
+                           },
+                           "end": {
+                              "line": 0,
+                              "character": 0
+                           }
+                        },
+                        "message": "No project was loaded, because more than one project file has been found in the root directory. Please change configuration to point a correct project file.",
+                        "severity": 1,
+                        "source": "project"
+                     }
+                  ],
+                  "triggerKind": 2
+               }
+            }
+         },
+         "wait": [
+            {
+               "id": 13,
+               "result": [
+                  {
+                     "title": "Open settings for ada.projectFile",
+                     "kind": "quickfix",
+                     "diagnostics": [
+                        {
+                           "range": {
+                              "start": {
+                                 "line": 0,
+                                 "character": 0
+                              },
+                              "end": {
+                                 "line": 0,
+                                 "character": 0
+                              }
+                           },
+                           "severity": 1,
+                           "source": "project",
+                           "message": "No project was loaded, because more than one project file has been found in the root directory. Please change configuration to point a correct project file."
+                        }
+                     ],
+                     "isPreferred": true,
+                     "command": {
+                        "title": "Open settings for ada.projectFile",
+                        "command": "workbench.action.openSettings",
+                        "arguments": "ada.projectFile"
+                     }
+                  }
+               ]
+            }
+         ]
+      }
+   },
+   {
+      "stop": {
+         "exit_code": 0
+      }
+   }
+]
diff --git a/testsuite/ada_lsp/project_config.multiple_project_diagnostics/test.yaml b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/test.yaml
new file mode 100644
index 000000000..523c27b84
--- /dev/null
+++ b/testsuite/ada_lsp/project_config.multiple_project_diagnostics/test.yaml
@@ -0,0 +1 @@
+title: 'project_config.multiple_project_diagnostics'