diff --git a/lib/vers/make-print-version.c b/lib/vers/make-print-version.c
index b20969d14..698029a5f 100644
--- a/lib/vers/make-print-version.c
+++ b/lib/vers/make-print-version.c
@@ -37,6 +37,7 @@ RCSID("$Id$");
 #endif
 
 #include <stdio.h>
+#include <string.h>
 
 #ifdef KRB5
 extern const char *heimdal_version;