diff --git a/pkgs/applications/version-management/mercurial/default.nix b/pkgs/applications/version-management/mercurial/default.nix
index 1de1fda2a5e5..541bc8799a83 100644
--- a/pkgs/applications/version-management/mercurial/default.nix
+++ b/pkgs/applications/version-management/mercurial/default.nix
@@ -34,9 +34,9 @@ in python2Packages.buildPythonApplication {
       hgk=$out/lib/${python.libPrefix}/site-packages/hgext/hgk.py
       EOF
       # setting HG so that hgk can be run itself as well (not only hg view)
-      WRAP_TK=" --set TK_LIBRARY \"${tk}/lib/${tk.libPrefix}\"
-                --set HG \"$out/bin/hg\"
-                --prefix PATH : \"${tk}/bin\" "
+      WRAP_TK=" --set TK_LIBRARY ${tk}/lib/${tk.libPrefix}
+                --set HG $out/bin/hg
+                --prefix PATH : ${tk}/bin "
     '') +
     ''
       for i in $(cd $out/bin && ls); do