diff --git a/kernel/core_hook.c b/kernel/core_hook.c
index c4432855..7a021a14 100644
--- a/kernel/core_hook.c
+++ b/kernel/core_hook.c
@@ -67,7 +67,8 @@ static void setup_groups(struct root_profile *profile, struct cred *cred)
 		return;
 	}
 
-	for (int i = 0; i < ngroups; i++) {
+	int i;
+	for (i = 0; i < ngroups; i++) {
 		gid_t gid = profile->groups[i];
 		kgid_t kgid = make_kgid(current_user_ns(), gid);
 		if (!gid_valid(kgid)) {