diff --git a/omz-custom/tmux-sessions.sh b/omz-custom/tmux-sessions.sh
index 047cd23..86aa983 100644
--- a/omz-custom/tmux-sessions.sh
+++ b/omz-custom/tmux-sessions.sh
@@ -2,7 +2,7 @@ function mx() {
     PROJECT_DIR=${1:-.}
     SAFE_INPUT=$(printf '%s\n' "$PROJECT_DIR" | sed 's/[][\.^$*+?{}|()]/\\&/g')
     ALL_PROJECTS=$(get_mux_sessions)
-    IS_VALID_PROJECT=$(echo $ALL_PROJECTS | grep -o "[[:<:]]$SAFE_INPUT\w*" | head -1)
+    IS_VALID_PROJECT=$(echo $ALL_PROJECTS | grep -io "[[:<:]]$SAFE_INPUT\w*" | head -1)
     if [[ $IS_VALID_PROJECT != "" ]]; then
         tmuxinator start "$IS_VALID_PROJECT"
         return 1