diff --git a/pkgs/development/python-modules/datasette/default.nix b/pkgs/development/python-modules/datasette/default.nix
index 55c9cd652aa8..e5d169b6d3cc 100644
--- a/pkgs/development/python-modules/datasette/default.nix
+++ b/pkgs/development/python-modules/datasette/default.nix
@@ -43,7 +43,7 @@ buildPythonPackage rec {
 
   postPatch = ''
     substituteInPlace setup.py \
-      --replace '"pytest-runner"' "
+      --replace '"pytest-runner"' ""
   '';
 
   propagatedBuildInputs = [