diff --git a/scripts/gulpfiles/build_tasks.js b/scripts/gulpfiles/build_tasks.js
index ac037ff0385..4ed0d6232ec 100644
--- a/scripts/gulpfiles/build_tasks.js
+++ b/scripts/gulpfiles/build_tasks.js
@@ -343,18 +343,14 @@ function buildDeps(done) {
 
   const args = roots.map(root => `--root '${root}' `).join('');
   execSync(
-      `set -o pipefail; \
-       (closure-make-deps ${args} >'${DEPS_FILE}') 2>&1 \
-       | (grep -v '^WARNING in' ; true)`,
+      `closure-make-deps ${args} 2>/dev/null >'${DEPS_FILE}'`,
       {stdio: 'inherit'});
 
   // Use grep to filter out the entries that are already in deps.js.
   const testArgs = testRoots.map(root => `--root '${root}' `).join('');
   execSync(
-      `set -o pipefail; \
-       (closure-make-deps ${testArgs} | grep 'tests/mocha' \
-            > '${TEST_DEPS_FILE}') 2>&1 \
-       | (grep -v '^WARNING in' ; true)`,
+      `closure-make-deps ${testArgs} 2>/dev/null \
+           | grep 'tests/mocha' > '${TEST_DEPS_FILE}'`,
       {stdio: 'inherit'});
   done();
 }