diff --git a/.shell-history b/.shell-history
index 28b9845..6a434dc 100644
--- a/.shell-history
+++ b/.shell-history
@@ -8,7 +8,7 @@ fi
 # Each terminal's history will be stored in
 # its own file
 if [ ! -z "${TMUX_PANE}" ]; then
-	HISTSUFFIX="${TMUX_PANE}"
+	HISTSUFFIX=$(tmux display-message -p '#S#W' | sha256sum | cut -d' ' -f1)
 else
 	HISTSUFFIX=`tty | sed 's/\///g;s/^dev//g'`
 fi