diff --git a/tools/run_tests/run_node.sh b/tools/run_tests/run_node.sh
index 85e3a38f844e750f11fdf3b2f9a12ecb7f1140ed..d0a74e7e1ef4ed26215496d1fc2c8bd3156ba355 100755
--- a/tools/run_tests/run_node.sh
+++ b/tools/run_tests/run_node.sh
@@ -40,13 +40,14 @@ root=`pwd`
if [ "$CONFIG" = "gcov" ]
then
./node_modules/.bin/istanbul cover --dir reports/node_coverage \
- ./node_modules/.bin/_mocha -- --timeout 8000 src/node/test
+ -x **/interop/* ./node_modules/.bin/_mocha -- --timeout 8000 src/node/test
cd build
gcov Release/obj.target/grpc/ext/*.o
lcov --base-directory . --directory . -c -o coverage.info
+ lcov -e coverage.info '**/src/node/ext/*' -o coverage.info
genhtml -o ../reports/node_ext_coverage --num-spaces 2 \
-t 'Node gRPC test coverage' coverage.info --rc genhtml_hi_limit=95 \
- --rc genhtml_med_limit=80
+ --rc genhtml_med_limit=80 --no-prefix
echo '<html><head><meta http-equiv="refresh" content="0;URL=lcov-report/index.html"></head></html>' > \
../reports/node_coverage/index.html
else