diff --git a/lib/libc/posix1e/acl_support.c b/lib/libc/posix1e/acl_support.c
index a136407b287a..f2e83b7cb5a5 100644
--- a/lib/libc/posix1e/acl_support.c
+++ b/lib/libc/posix1e/acl_support.c
@@ -302,7 +302,7 @@ acl_name_to_id(acl_tag_t tag, char *name, uid_t *id)
 
 	case ACL_GROUP:
 		g = getgrnam(name);
-		if (g) {
+		if (!g) {
 			errno = EINVAL;
 			return (-1);
 		}
diff --git a/lib/libposix1e/acl_support.c b/lib/libposix1e/acl_support.c
index a136407b287a..f2e83b7cb5a5 100644
--- a/lib/libposix1e/acl_support.c
+++ b/lib/libposix1e/acl_support.c
@@ -302,7 +302,7 @@ acl_name_to_id(acl_tag_t tag, char *name, uid_t *id)
 
 	case ACL_GROUP:
 		g = getgrnam(name);
-		if (g) {
+		if (!g) {
 			errno = EINVAL;
 			return (-1);
 		}