diff --git a/src/common/appbase.cpp b/src/common/appbase.cpp
index 339fe276c4..08b769724b 100644
--- a/src/common/appbase.cpp
+++ b/src/common/appbase.cpp
@@ -944,6 +944,7 @@ static void LINKAGEMODE SetTraceMasks()
 #endif // wxUSE_LOG
 }
 
+static
 bool DoShowAssertDialog(const wxString& msg)
 {
     // under MSW we can show the dialog even in the console mode