diff --git a/mac_installer/preinstall b/mac_installer/preinstall
index 43a39d0cb6..21b9a627d4 100644
--- a/mac_installer/preinstall
+++ b/mac_installer/preinstall
@@ -1,7 +1,7 @@
-#!/bin/csh
+#!/bin/sh
 
 ##
-# Pre-Install / Pre-Upgrade Script for Macintosh BOINC Manager for OS X revised 9/5/07
+# Pre-Install / Pre-Upgrade Script for Macintosh BOINC Manager for OS X revised 9/6/07
 ##
 
 # If we are replacing an earlier GridRepublic installation, fix the data directory name before installing