diff --git a/extra_features_cargo_install.sh b/extra_features_cargo_install.sh
index 91b36eee58..3e1305ba12 100644
--- a/extra_features_cargo_install.sh
+++ b/extra_features_cargo_install.sh
@@ -1 +1,3 @@
+#!/bin/sh
+
 cargo install --path . --features=extra