diff --git a/installer/resources/runplain.sh b/installer/resources/runplain.sh
index 644bdadcf9bfc02bc6bea03a86f7d13e5803e1f6..eaf2d297e06af0a3d362301122cd0505f51d6a40 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