diff --git a/install.rb b/install.rb
index 9f8a8eca1..0b2953e6d 100644
--- a/install.rb
+++ b/install.rb
@@ -6,7 +6,7 @@ puts "\nPlease make sure you have installed SQLite before proceeding.  For instr
 
 # array of required gems - add to as needed (specify a version if needed eg "gem_name, =x.x.x")
 $gems_required = ["ansi", "dm-core", "json", "data_objects", "do_sqlite3", "sqlite3-ruby", "dm-sqlite-adapter", 
-                  "parseconfig", "erubis", "dm-migrations"]
+                  "parseconfig", "erubis", "dm-migrations", "ruby-dev"]
 
 # array of missing non-version specific gems installed
 $gems_missing = Array.new