diff --git a/garlic/stages/exec.nix b/garlic/stages/exec.nix
index 80db4b8..cfe4af3 100644
--- a/garlic/stages/exec.nix
+++ b/garlic/stages/exec.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation {
   phases = [ "installPhase" ];
   installPhase = ''
     cat > $out <<'EOF'
-    #!/bin/sh
+    #!/bin/sh -e
     ${env}
 
     ''+pre+''