diff --git a/lib/des/rnd_keys.c b/lib/des/rnd_keys.c
index 9a1761536..8ed7086f6 100644
--- a/lib/des/rnd_keys.c
+++ b/lib/des/rnd_keys.c
@@ -84,7 +84,7 @@ static
 int
 sumFile (const char *name, int len, void *res)
 {
-  u_int32_t sum[2];
+  u_int32_t sum[2] = { 0, 0 };
   u_int32_t buf[1024*2];
   int fd, i;