diff --git a/include/wx/apptrait.h b/include/wx/apptrait.h
index f6750d2bc4..8a2b8c265e 100644
--- a/include/wx/apptrait.h
+++ b/include/wx/apptrait.h
@@ -24,7 +24,10 @@ class WXDLLIMPEXP_BASE wxMessageOutput;
 class WXDLLEXPORT wxRendererNative;
 class WXDLLIMPEXP_BASE wxString;
 
-extern "C" struct GSocketGUIFunctionsTable;
+extern "C"
+{
+    struct GSocketGUIFunctionsTable;
+}
 
 // ----------------------------------------------------------------------------
 // toolkit information