diff --git a/src/nspawn/nspawn-network.c b/src/nspawn/nspawn-network.c
index 97e2756658b..023b1e7e1a8 100644
--- a/src/nspawn/nspawn-network.c
+++ b/src/nspawn/nspawn-network.c
@@ -469,7 +469,7 @@ int test_network_interface_initialized(const char *name) {
         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
         int r;
 
-        if (path_is_read_only_fs("/sys"))
+        if (path_is_read_only_fs("/sys") > 0)
                 return 0;
 
         /* udev should be around. */