diff --git a/packages/grpc-js-xds/scripts/xds.sh b/packages/grpc-js-xds/scripts/xds.sh
index 8d94ae19..131cbd55 100755
--- a/packages/grpc-js-xds/scripts/xds.sh
+++ b/packages/grpc-js-xds/scripts/xds.sh
@@ -51,7 +51,6 @@ grpc/tools/run_tests/helper_scripts/prep_xds.sh
 GRPC_NODE_TRACE=xds_client,xds_resolver,cds_balancer,eds_balancer,priority,weighted_target,round_robin,resolving_load_balancer,subchannel,keepalive,dns_resolver,fault_injection,http_filter \
   GRPC_NODE_VERBOSITY=DEBUG \
   NODE_XDS_INTEROP_VERBOSITY=1 \
-  GRPC_XDS_EXPERIMENTAL_FAULT_INJECTION=1 \
   python3 grpc/tools/run_tests/run_xds_tests.py \
     --test_case="all,timeout,circuit_breaking,fault_injection" \
     --project_id=grpc-testing \
diff --git a/packages/grpc-js-xds/src/environment.ts b/packages/grpc-js-xds/src/environment.ts
index 18e9e70b..e1c2d815 100644
--- a/packages/grpc-js-xds/src/environment.ts
+++ b/packages/grpc-js-xds/src/environment.ts
@@ -15,4 +15,4 @@
  *
  */
 
-export const EXPERIMENTAL_FAULT_INJECTION = process.env.GRPC_XDS_EXPERIMENTAL_FAULT_INJECTION;
\ No newline at end of file
+export const EXPERIMENTAL_FAULT_INJECTION = (process.env.GRPC_XDS_EXPERIMENTAL_FAULT_INJECTION ?? 'true') === 'true';
\ No newline at end of file