diff --git a/pkgs/development/python-modules/azure-mgmt-monitor/default.nix b/pkgs/development/python-modules/azure-mgmt-monitor/default.nix
index 23e6bcf8cb4..252760950e5 100644
--- a/pkgs/development/python-modules/azure-mgmt-monitor/default.nix
+++ b/pkgs/development/python-modules/azure-mgmt-monitor/default.nix
@@ -28,8 +28,8 @@ buildPythonPackage rec {
   ];
 
   postInstall = lib.optionalString isPy3k ''
-    rm $out/${python.sitePackages}/azure/__init__.py
-    rm $out/${python.sitePackages}/azure/mgmt/__init__.py
+    rm -rf $out/${python.sitePackages}/azure/__init__.py
+    rm -rf $out/${python.sitePackages}/azure/mgmt/__init__.py
   '';
 
   # has no tests