diff --git a/util/makedefs.c b/util/makedefs.c
index 33cf3b2a5..04519c8dc 100644
--- a/util/makedefs.c
+++ b/util/makedefs.c
@@ -1577,7 +1577,7 @@ static const char *build_opts[] = {
 #ifdef USE_ISAAC64
     "pseudo random numbers generated by ISAAC64",
 #ifdef DEV_RANDOM
-#ifdef __STDC__
+#ifdef NHSTDC
     /* include which specific one */
     "strong PRNG seed available from " DEV_RANDOM,
 #else