diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index a542c6ba84b322117e11d24fa8a134bed777550e..6d38b7c9c824b869d449c45612b820e0cb44e3d2 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -68,10 +68,12 @@ struct kconf_id {
 	enum symbol_type stype;
 };
 
+#ifdef YYDEBUG
+extern int zconfdebug;
+#endif
+
 int zconfparse(void);
 void zconfdump(FILE *out);
-
-extern int zconfdebug;
 void zconf_starthelp(void);
 FILE *zconf_fopen(const char *name);
 void zconf_initscan(const char *name);