diff --git a/nixos/tests/mongodb.nix b/nixos/tests/mongodb.nix
index ee7fc50f7ec..a637ec4bfc0 100644
--- a/nixos/tests/mongodb.nix
+++ b/nixos/tests/mongodb.nix
@@ -33,7 +33,7 @@ import ./make-test-python.nix ({ pkgs, ... }:
     nodes = {
       node = {...}: {
         environment.systemPackages = with pkgs; [
-#          mongodb-3_4
+          mongodb-3_4
           mongodb-3_6
           mongodb-4_0
         ];
@@ -43,7 +43,7 @@ import ./make-test-python.nix ({ pkgs, ... }:
     testScript = ''
       node.start()
     ''
-#      + runMongoDBTest pkgs.mongodb-3_4
+      + runMongoDBTest pkgs.mongodb-3_4
       + runMongoDBTest pkgs.mongodb-3_6 
       + runMongoDBTest pkgs.mongodb-4_0
       + ''