diff --git a/utilities/utilities.plugin.zsh b/utilities/utilities.plugin.zsh
index 3a13aaf..357b65d 100644
--- a/utilities/utilities.plugin.zsh
+++ b/utilities/utilities.plugin.zsh
@@ -26,16 +26,21 @@ fi
 
 # Passthrough an escape sequences tmux doesn't know about.
 tmux-dcs-passthrough() {
+  local escape_sequence=$1
   if [ -n "$TMUX" ]; then
-    printf "\x1bPtmux;\x1b$1\x1b\\"
+    # Replace single \x1b or \033 with two, this is required for tmux to
+    # properly pass-through the escape sequence.
+    escape_sequence=${escape_sequence//\\x1b/\\x1b\\x1b}
+    escape_sequence=${escape_sequence//\\033/\\x1b\\x1b}
+    printf '\x1bPtmux;\x1b'"$escape_sequence"'\x1b\\'
   else
-    printf "$1"
+    printf "$escape_sequence"
   fi
 }
 
-# OSC 9 - Post a notification - supported by iTerm2, maybe others?
+# OSC 9 - Post a notification - supported by iTerm2, kitty, maybe others?
 notify() {
-  tmux-dcs-passthrough "\x1b]9;$*\x7"
+  tmux-dcs-passthrough '\x1b]9;'"$*"'\x7'
 }
 
 # Detect the type and extract an archive file.