diff --git a/src/include/config.h.in b/src/include/config.h.in
index 7b1e44d159c46fc269f1d707216fe8177d35b885..c4d118d6b4b413d38287c88d642e27385efe3cb8 100644
--- a/src/include/config.h.in
+++ b/src/include/config.h.in
@@ -223,7 +223,7 @@ extern void srandom(int seed);
 #undef HAVE_LONG_INT_64
 
 /* Set to 1 if type "long long int" works and is 64 bits */
-#undef HAVE_LONG_LONG_INT_64_Ld
+#undef HAVE_LONG_LONG_INT_64_lld
 #undef HAVE_LONG_LONG_INT_64_qd
 
 /*