diff --git a/kin/grammar/PBXProj.g4 b/kin/grammar/PBXProj.g4
index 64c8799..2bb156e 100644
--- a/kin/grammar/PBXProj.g4
+++ b/kin/grammar/PBXProj.g4
@@ -926,7 +926,7 @@ key_value
     | str_number_variable '=' NUMBER ';'
     | str_number_variable '=' ALPHA_NUMERIC ';'
     | str_number_variable '=' '{' key_value '}' ';'
-    | str_number_variable '=' '(' (str_number_variable ',')* ')' ';'
+    | str_number_variable '=' '(' str_number_variable? (',' str_number_variable)* ','? ')' ';'
     ;
 
 build_configurations
diff --git a/tests/ok/016.pbxproj b/tests/ok/016.pbxproj
new file mode 100644
index 0000000..38c8db8
--- /dev/null
+++ b/tests/ok/016.pbxproj
@@ -0,0 +1,15 @@
+{
+  archiveVersion = 1;
+  classes = {};
+  objectVersion = 46;
+  objects = {
+    FE870E28DC2371E7ACA886F03F460581 = {isa = PBXFileReference; explicitFileType = text.xcconfig; name = "Something.xcconfig"; path = "Configurations/Something.xcconfig"; sourceTree = "<group>"; };
+    78452DDA02BFEF5D6BA29AEFB4B1266A = {isa = PBXGroup; children = (FE870E28DC2371E7ACA886F03F460581,); name = Configurations; sourceTree = "<group>"; };
+    49FBBF861C10C2A200A1A4BB = {isa = PBXProject; buildConfigurationList = 49FBBF891C10C2A200A1A4BB; compatibilityVersion = "Xcode 3.2"; hasScannedForEncodings = 0; mainGroup = 49FBBF851C10C2A200A1A4BB; productRefGroup = 49FBBF8F1C10C2A200A1A4BB; projectDirPath = ""; projectRoot = ""; targets = (49FBBF8D1C10C2A200A1A4BB, 4973659B1C19BC6E00837617,); };
+    49FBBF951C10C2A200A1A4BB = {isa = PBXVariantGroup; children = (49FBBF961C10C2A200A1A4BB,); name = Main.storyboard; sourceTree = "<group>"; };
+    49FBBF9A1C10C2A200A1A4BB = {isa = PBXVariantGroup; children = (49FBBF9B1C10C2A200A1A4BB,); name = LaunchScreen.storyboard; sourceTree = "<group>"; };
+    497365A41C19BC6E00837617 = {isa = XCBuildConfiguration; baseConfigurationReference = 274E42B0193BA6FEFA8FD71C; buildSettings = { FRAMEWORK_SEARCH_PATHS = ("$(inherited)", "$(PROJECT_DIR)/build/Debug-iphoneos"); }; name = Debug; };
+    49FBBFB61C10C2A200A1A4BB = {isa = XCConfigurationList; buildConfigurations = (49FBBFB71C10C2A200A1A4BB, 49FBBFB81C10C2A200A1A4BB,); defaultConfigurationIsVisible = 0; defaultConfigurationName = Release; };
+  };
+  rootObject = 49FBBF861C10C2A200A1A4BB;
+}