diff --git a/modules/osx/functions/mand b/modules/osx/functions/mand
index 2902c76..b62fab3 100644
--- a/modules/osx/functions/mand
+++ b/modules/osx/functions/mand
@@ -8,7 +8,7 @@
 function mand {
   if (( $# > 0 )); then
     zstyle -s ':prezto:module:osx:man' dash-keyword 'dashkw' || dashkw='manpages'
-    open "dash://$dashkw:$1" 2> /dev/null
+    open "dash://$dashkw%3A$1" 2> /dev/null
     if (( $? != 0 )); then
       print "$0: Dash is not installed" >&2
       break