diff --git a/pkgs/tools/networking/dd-agent/default.nix b/pkgs/tools/networking/dd-agent/default.nix
index ddef8a70012..fa18e6c0ce5 100644
--- a/pkgs/tools/networking/dd-agent/default.nix
+++ b/pkgs/tools/networking/dd-agent/default.nix
@@ -47,7 +47,7 @@ in stdenv.mkDerivation rec {
     pythonPackages.ntplib
     pythonPackages.simplejson
     pythonPackages.pyyaml
-    pythonPackages.pymongo
+    pythonPackages.pymongo_2_9_1
     pythonPackages.python-etcd
     pythonPackages.consul
     docker_1_10