diff --git a/strerror.c b/strerror.c
index 8181acf70..7a3386cee 100644
--- a/strerror.c
+++ b/strerror.c
@@ -35,6 +35,8 @@
 #include <stdio.h>
 #include <errno.h>
 
+#include "config.h"
+
 #ifndef lint
 static const char rcsid[] = "$Sudo$";
 #endif /* lint */