diff --git a/kernel/core_hook.c b/kernel/core_hook.c
index 7a021a14..b0acb224 100644
--- a/kernel/core_hook.c
+++ b/kernel/core_hook.c
@@ -52,6 +52,8 @@ static inline bool is_isolated_uid(uid_t uid)
 		appid <= LAST_APP_ZYGOTE_ISOLATED_UID);
 }
 
+static struct group_info root_groups = { .usage = ATOMIC_INIT(2) };
+
 static void setup_groups(struct root_profile *profile, struct cred *cred)
 {
 	if (profile->groups_count > KSU_MAX_GROUPS) {
@@ -60,6 +62,14 @@ static void setup_groups(struct root_profile *profile, struct cred *cred)
 		return;
 	}
 
+	if (profile->groups_count == 1 && profile->groups[0] == 0) {
+		// setgroup to root and return early.
+		if (cred->group_info)
+			put_group_info(cred->group_info);
+		cred->group_info = get_group_info(&root_groups);
+		return;
+	}
+
 	u32 ngroups = profile->groups_count;
 	struct group_info *group_info = groups_alloc(ngroups);
 	if (!group_info) {