diff --git a/install-tmux.ps1 b/install-tmux.ps1
index 79acd2a..c32c4ec 100644
--- a/install-tmux.ps1
+++ b/install-tmux.ps1
@@ -210,7 +210,6 @@ unbind -Tcopy-mode MouseDrag1Pane
 
 # for pi
 set -g extended-keys on
-set -g extended-keys-format csi-u
 '@
 
 [System.IO.File]::WriteAllText($ConfFile, $tmuxConf, [System.Text.UTF8Encoding]::new($false))
diff --git a/install-tmux.sh b/install-tmux.sh
index dea7545..ac085a1 100755
--- a/install-tmux.sh
+++ b/install-tmux.sh
@@ -197,7 +197,6 @@ set -g default-terminal "screen-256color"
 
 # for pi
 set -g extended-keys on
-set -g extended-keys-format csi-u
 TMUXCONF
 
 success ".tmux.conf deployed to $CONF_FILE"