diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index a56161cf289..25a48d3ba78 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -198,12 +198,12 @@
 /* Define to 1 if you have the <editline/readline.h> header file. */
 #undef HAVE_EDITLINE_READLINE_H
 
-/* Define to 1 if you have the `explicit_bzero' function. */
-#undef HAVE_EXPLICIT_BZERO
-
 /* Define to 1 if you have the <execinfo.h> header file. */
 #undef HAVE_EXECINFO_H
 
+/* Define to 1 if you have the `explicit_bzero' function. */
+#undef HAVE_EXPLICIT_BZERO
+
 /* Define to 1 if you have the `fdatasync' function. */
 #undef HAVE_FDATASYNC