diff --git a/R/loaded.r b/R/loaded.r
index 39d99e67..4d9d2ead 100644
--- a/R/loaded.r
+++ b/R/loaded.r
@@ -41,7 +41,11 @@ register_mod = function (info, mod_ns) {
 
 #' @rdname loaded
 deregister_mod = function (info) {
-    rm(list = info$source_path, envir = loaded_mods)
+    # May already have been removed if called by `unload_mod_recursive`, where
+    # a given module is imported by multiple submodules.
+    if (exists(info$source_path, envir = loaded_mods)) {
+        rm(list = info$source_path, envir = loaded_mods)
+    }
 }
 
 #' @rdname loaded
diff --git a/tests/testthat/mod/reload/nested/a.r b/tests/testthat/mod/reload/nested/a.r
new file mode 100644
index 00000000..2fdd52f7
--- /dev/null
+++ b/tests/testthat/mod/reload/nested/a.r
@@ -0,0 +1 @@
+box::export()
diff --git a/tests/testthat/mod/reload/nested/b.r b/tests/testthat/mod/reload/nested/b.r
new file mode 100644
index 00000000..fe779e2a
--- /dev/null
+++ b/tests/testthat/mod/reload/nested/b.r
@@ -0,0 +1,3 @@
+box::use(./a)
+
+box::export()
diff --git a/tests/testthat/mod/reload/nested/c.r b/tests/testthat/mod/reload/nested/c.r
new file mode 100644
index 00000000..acf2fc98
--- /dev/null
+++ b/tests/testthat/mod/reload/nested/c.r
@@ -0,0 +1,3 @@
+box::use(./a, ./b)
+
+box::export()
diff --git a/tests/testthat/test-reload.r b/tests/testthat/test-reload.r
index d04b3e8f..16fa23a3 100644
--- a/tests/testthat/test-reload.r
+++ b/tests/testthat/test-reload.r
@@ -115,3 +115,9 @@ test_that('`reload` shows expected errors', {
         '"reload" expects a module object, got "x", which is of type "integer" instead'
     )
 })
+
+test_that('reloading a module used twice does not cause a warning', {
+    box::use(mod/reload/nested/c)
+
+    expect_warning(box::reload(c), NA)
+})