diff --git a/installer/resources/runplain.sh b/installer/resources/runplain.sh
index 644bdadcf..eaf2d297e 100644
--- a/installer/resources/runplain.sh
+++ b/installer/resources/runplain.sh
@@ -1,4 +1,5 @@
-#
+#!/bin/sh
+
 # This runs the router by itself, WITHOUT the wrapper.
 # This means the router will not restart if it crashes.
 # Also, you will be using the default memory size, which is