diff --git a/lib/des/fcrypt.c b/lib/des/fcrypt.c
index 99ffd6389..65d592618 100644
--- a/lib/des/fcrypt.c
+++ b/lib/des/fcrypt.c
@@ -112,6 +112,9 @@
  * ----------------------------------------------------------------------------
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
 #include <md5.h>
 
 static unsigned char itoa64[] =		/* 0 ... 63 => ascii - 64 */