diff --git a/crypto/stack/safestack.h b/crypto/stack/safestack.h
index 6010b7f122..00bb428491 100644
--- a/crypto/stack/safestack.h
+++ b/crypto/stack/safestack.h
@@ -170,7 +170,7 @@ STACK_OF(type) \
 #define SKM_sk_push(type, st,val) \
 	sk_push(st, (char *)val)
 #define SKM_sk_unshift(type, st,val) \
-	sk_unshift(st, val)
+	sk_unshift(st, (char *)val)
 #define SKM_sk_find(type, st,val) \
 	sk_find(st, (char *)val)
 #define SKM_sk_delete(type, st,i) \