diff --git a/runtest.sh b/runtest.sh
index 90bf123..d8bd2ec 100755
--- a/runtest.sh
+++ b/runtest.sh
@@ -168,8 +168,8 @@ for ((COUNTER = 1; COUNTER <= NUM_TESTS; COUNTER++)); do
       LISTENER_SAMPLE_FILE="${TEST_FILE%.csv}-listener-$COUNTER-$i.csv"
 
       log "Launching listener for sample $COUNTER/$i..."
-      
-      READY_FILE="/tmp/listener_ready_$COUNTER_$i"
+
+      READY_FILE="/tmp/listener_ready_${COUNTER}_${i}"
 
       sudo "${SCRIPT_DIRECTORY}/listener.py" \
         --main-iface "$INTERFACE" \