diff --git a/tools/jenkins/run_interop.sh b/tools/jenkins/run_interop.sh
index c80c374aceecbc81b27b8ceaec14b9e433d72204..61398933f3bbd2e859c662d1d8fe32cfe1e6892c 100755
--- a/tools/jenkins/run_interop.sh
+++ b/tools/jenkins/run_interop.sh
@@ -32,6 +32,6 @@
 set -ex
 
 # Enter the gRPC repo root
-cd `dirname $0`/../..
+cd $(dirname $0)/../..
 
 tools/run_tests/run_interop_tests.py --l all --s all --cloud_to_prod --use_docker -t -j 8