diff --git a/tools/gpstest/run_unittest.sh b/tools/gpstest/run_unittest.sh
index 9f93fdfc9a..e0ca017a6d 100755
--- a/tools/gpstest/run_unittest.sh
+++ b/tools/gpstest/run_unittest.sh
@@ -4,7 +4,7 @@
 
 # run limeGPS with random static location
 timeout 300 ./simulate_gps_signal.py 32.7518 -117.1962 &
-gps_PID=$(ps -aux | grep -m 1 "timeout 300" | cut -d ' ' -f 7)
+gps_PID=$(ps -aux | grep -m 1 "timeout 300" | awk '{print $2}')
 
 echo "starting limeGPS..."
 sleep 10