diff --git a/pkgs/development/python-modules/py-nymta/default.nix b/pkgs/development/python-modules/py-nymta/default.nix
index e7c1e7de1f0e..add160580ec8 100644
--- a/pkgs/development/python-modules/py-nymta/default.nix
+++ b/pkgs/development/python-modules/py-nymta/default.nix
@@ -25,6 +25,10 @@ buildPythonPackage (finalAttrs: {
 
   build-system = [ setuptools ];
 
+  pythonRelaxDeps = [
+    "gtfs-realtime-bindings"
+  ];
+
   dependencies = [
     aiofiles
     aiohttp