diff --git a/test/core/end2end/end2end_test.sh b/test/core/end2end/end2end_test.sh
index 5bfb253090a..6b23d848be6 100755
--- a/test/core/end2end/end2end_test.sh
+++ b/test/core/end2end/end2end_test.sh
@@ -15,7 +15,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-if [ -z "$3" ]
+if [ -n "$3" ]
   then
     export GRPC_POLL_STRATEGY=$3
 fi