diff --git a/util/configlexer.c b/util/configlexer.c
index 5bb542a04..819212a28 100644
--- a/util/configlexer.c
+++ b/util/configlexer.c
@@ -94,7 +94,7 @@ typedef unsigned int flex_uint32_t;
 
 #else	/* ! __cplusplus */
 
-#ifdef __STDC__
+#if __STDC__
 
 #define YY_USE_CONST