diff --git a/criu/fdstore.c b/criu/fdstore.c
index a4583fdf4..7c8eb7208 100644
--- a/criu/fdstore.c
+++ b/criu/fdstore.c
@@ -107,8 +107,13 @@ int fdstore_add(int fd)
 
 int fdstore_get(int id)
 {
-	int sk = get_service_fd(FDSTORE_SK_OFF);
-	int fd;
+	int sk, fd;
+
+	sk = get_service_fd(FDSTORE_SK_OFF);
+	if (sk < 0) {
+		pr_err("Cannot get FDSTORE_SK_OFF fd\n");
+		return -1;
+	}
 
 	mutex_lock(&desc->lock);
 	if (setsockopt(sk, SOL_SOCKET, SO_PEEK_OFF, &id, sizeof(id))) {
diff --git a/criu/namespaces.c b/criu/namespaces.c
index c8baf42fc..eeb9205d0 100644
--- a/criu/namespaces.c
+++ b/criu/namespaces.c
@@ -1364,6 +1364,10 @@ int __userns_call(const char *func_name, uns_call_t call, int flags,
 		return call(arg, fd, getpid());
 
 	sk = get_service_fd(USERNSD_SK);
+	if (sk < 0) {
+		pr_err("Cannot get USERNSD_SK fd\n");
+		return -1;
+	}
 	pr_debug("uns: calling %s (%d, %x)\n", func_name, fd, flags);
 
 	if (!async)