diff --git a/lib/mkstemp-safer.c b/lib/mkstemp-safer.c
index c231bffe3..5ae3413f0 100644
--- a/lib/mkstemp-safer.c
+++ b/lib/mkstemp-safer.c
@@ -18,6 +18,10 @@
 
 /* Written by Paul Eggert.  */
 
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
 #include "stdlib-safer.h"
 
 #include <stdlib.h>