diff --git a/pkgs/tools/filesystems/ceph/generic.nix b/pkgs/tools/filesystems/ceph/generic.nix
index b899192aa3c..bece841d5f5 100644
--- a/pkgs/tools/filesystems/ceph/generic.nix
+++ b/pkgs/tools/filesystems/ceph/generic.nix
@@ -101,7 +101,7 @@ let
   wrapArgs = "--set PYTHONPATH \"$(toPythonPath $lib)\""
     + " --prefix PYTHONPATH : \"$(toPythonPath ${python.modules.readline})\""
     + " --prefix PYTHONPATH : \"$(toPythonPath ${pythonPackages.flask})\""
-    + " --set PATH : \"$out/bin\"";
+    + " --set PATH \"$out/bin\"";
 in
 stdenv.mkDerivation {
   name="ceph-${version}";