diff --git a/pkgs/development/python-modules/generic/wrap.sh b/pkgs/development/python-modules/generic/wrap.sh
index 7cc728491900..71269945d6f4 100644
--- a/pkgs/development/python-modules/generic/wrap.sh
+++ b/pkgs/development/python-modules/generic/wrap.sh
@@ -52,7 +52,8 @@ createBuildInputsPth() {
     if [ foo"$inputs" != foo ]; then
         for x in $inputs; do
             if test -d "$x"/lib/@libPrefix@/site-packages; then
-                echo $x >> "$out"/lib/@libPrefix@/site-packages/${name}-nix-python-$category.pth
+                echo $x/lib/@libPrefix@/site-packages \
+                    >> "$out"/lib/@libPrefix@/site-packages/${name}-nix-python-$category.pth
             fi
         done
     fi