diff --git a/pkgs/development/python-modules/oslo-config/default.nix b/pkgs/development/python-modules/oslo-config/default.nix
index 7cdfb9061fb..a76937278c4 100644
--- a/pkgs/development/python-modules/oslo-config/default.nix
+++ b/pkgs/development/python-modules/oslo-config/default.nix
@@ -17,6 +17,6 @@ buildPythonPackage rec {
   doCheck = false;
 
   postPatch = ''
-    substituteInPlace requirements.txt --replace "argparse"
+    substituteInPlace requirements.txt --replace "argparse" ""
   '';
 }