diff --git a/include/wx/unix/apptbase.h b/include/wx/unix/apptbase.h
index bf33b0e7c4..fc238d1b19 100644
--- a/include/wx/unix/apptbase.h
+++ b/include/wx/unix/apptbase.h
@@ -12,7 +12,7 @@
 #ifndef _WX_UNIX_APPTBASE_H_
 #define _WX_UNIX_APPTBASE_H_
 
-class wxExecuteData;
+struct wxExecuteData;
 class wxPipe;
 
 // ----------------------------------------------------------------------------