diff --git a/src/config.in b/src/config.in
index 4a53d2d943d..a111c69d89d 100644
--- a/src/config.in
+++ b/src/config.in
@@ -129,6 +129,7 @@ and this notice must be preserved on all copies.  */
 #undef HAVE_MKDIR
 #undef HAVE_RMDIR
 #undef HAVE_RANDOM
+#undef HAVE_RAND48
 #undef HAVE_BCOPY
 #undef HAVE_BCMP
 #undef HAVE_LOGB