diff --git a/bin/tat b/bin/tat
index b8a02a5..901f252 100755
--- a/bin/tat
+++ b/bin/tat
@@ -10,7 +10,7 @@ not_in_tmux() {
 }
 
 session_exists() {
-  tmux has-session -t "$session_name"
+  tmux has-session -t "=$session_name"
 }
 
 create_detached_session() {