diff --git a/modules/osx/functions/manb b/modules/osx/functions/manb
index aac5fb5..66bcd6f 100644
--- a/modules/osx/functions/manb
+++ b/modules/osx/functions/manb
@@ -9,7 +9,7 @@ function manb {
   local page
   if (( $# > 0 )); then
     for page in "$@"; do
-      open "man:$page" 2>/dev/null
+      open "man://$page" 2>/dev/null
       if (( $? != 0 )); then
         print "$0: Bwana is not installed" >&2
         break