diff --git a/lib/hcrypto/evp.c b/lib/hcrypto/evp.c
index bebcbbae8..155ed495c 100644
--- a/lib/hcrypto/evp.c
+++ b/lib/hcrypto/evp.c
@@ -480,7 +480,7 @@ null_Update (void *m, const void * data, size_t size)
 {
 }
 static void
-null_Final(void *res, struct void *m)
+null_Final(void *res, void *m)
 {
 }