diff --git a/webif/lib/ts.class b/webif/lib/ts.class
index c43bc9a..7bbf52c 100644
--- a/webif/lib/ts.class
+++ b/webif/lib/ts.class
@@ -2,7 +2,7 @@
 if {![exists -proc class]} { package require oo }
 if {![exists -proc pack]} { package require pack }
 if {![exists -proc xconv]} { package require xconv }
-if {![exists -proc binary]} { package require binary }
+if {![exists -command binary]} { package require binary }
 source /mod/webif/lib/setup
 require system.class tvdb.class classdump