diff --git a/pkgs/misc/my-env/loadenv.sh b/pkgs/misc/my-env/loadenv.sh
index a162f8b853a..1aab4ac0208 100644
--- a/pkgs/misc/my-env/loadenv.sh
+++ b/pkgs/misc/my-env/loadenv.sh
@@ -11,5 +11,9 @@ export buildInputs
 export NIX_STRIP_DEBUG=0
 export TZ="$OLDTZ"
 
-@shell@
+if test $# -gt 0; then
+    exec "$@"
+else
+    exec @shell@
+fi