diff --git a/source/blender/editors/interface/interface_handlers.c b/source/blender/editors/interface/interface_handlers.c
index c01eb351fba..67154a41e32 100644
--- a/source/blender/editors/interface/interface_handlers.c
+++ b/source/blender/editors/interface/interface_handlers.c
@@ -1254,7 +1254,7 @@ static int ui_textedit_delete_selection(uiBut *but, uiHandleButtonData *data)
 	int len= strlen(str);
 	int change= 0;
 	if(but->selsta != but->selend && len) {
-		memmove( str+but->selsta, str+but->selend, len-but->selsta+1 );
+		memmove( str+but->selsta, str+but->selend, (len - but->selend) + 1 );
 		change= 1;
 	}