diff --git a/src/msw/textentry.cpp b/src/msw/textentry.cpp
index ba124d1e5a..346791506e 100644
--- a/src/msw/textentry.cpp
+++ b/src/msw/textentry.cpp
@@ -375,6 +375,8 @@ bool wxTextEntry::AutoComplete(const wxArrayString& choices)
     pAutoComplete->Release();
     return true;
 #else // !HAS_AUTOCOMPLETE
+    wxUnusedVar(choices);
+
     return false;
 #endif // HAS_AUTOCOMPLETE/!HAS_AUTOCOMPLETE
 }