diff --git a/redis.tcl b/redis.tcl
index c76166ef..81569796 100644
--- a/redis.tcl
+++ b/redis.tcl
@@ -25,6 +25,7 @@
 #
 # vwait forever
 
+package require Tcl 8.5
 package provide redis 0.1
 
 namespace eval redis {}