diff --git a/tools/widl/widl.c b/tools/widl/widl.c
index c2456f18bc6..39cd9beb2e7 100644
--- a/tools/widl/widl.c
+++ b/tools/widl/widl.c
@@ -84,7 +84,7 @@ static const char version_string[] = "Wine IDL Compiler version " PACKAGE_VERSIO
 
 int win32 = 1;
 int debuglevel = DEBUGLEVEL_NONE;
-int yy_flex_debug;
+int yydebug, yy_flex_debug;
 
 int pedantic = 0;
 static int do_everything = 1;