diff --git a/pkgs/applications/gis/grass/default.nix b/pkgs/applications/gis/grass/default.nix
index 7d2828115f77..790997e328b4 100644
--- a/pkgs/applications/gis/grass/default.nix
+++ b/pkgs/applications/gis/grass/default.nix
@@ -59,7 +59,7 @@ stdenv.mkDerivation {
   postInstall = ''
     wrapProgram $out/bin/grass70 \
     --set PYTHONPATH $PYTHONPATH \
-    --set GRASS_PYTHON ${python2Packages.python}/bin/${python2Packages.python.executable}
+    --set GRASS_PYTHON ${python2Packages.python}/bin/${python2Packages.python.executable} \
     --suffix LD_LIBRARY_PATH ':' '${gdal}/lib'
     ln -s $out/grass-*/lib $out/lib
   '';