diff --git a/lighthouse-core/gather/driver.js b/lighthouse-core/gather/driver.js
index d246bc7769e9..7bd9887557ae 100644
--- a/lighthouse-core/gather/driver.js
+++ b/lighthouse-core/gather/driver.js
@@ -701,6 +701,11 @@ class Driver {
 
     return collectUsage;
   }
+
+  blockUrlPatterns(urlPatterns) {
+    const promiseArr = urlPatterns.map(url => this.sendCommand('Network.addBlockedURL', {url}));
+    return Promise.all(promiseArr);
+  }
 }
 
 /**
diff --git a/lighthouse-core/gather/gather-runner.js b/lighthouse-core/gather/gather-runner.js
index ae7286670fdf..6c155fe2d950 100644
--- a/lighthouse-core/gather/gather-runner.js
+++ b/lighthouse-core/gather/gather-runner.js
@@ -96,7 +96,8 @@ class GatherRunner {
       .then(_ => driver.enableRuntimeEvents())
       .then(_ => driver.evaluateScriptOnLoad('window.__nativePromise = Promise;'))
       .then(_ => driver.cleanAndDisableBrowserCaches())
-      .then(_ => driver.clearDataForOrigin(options.url));
+      .then(_ => driver.clearDataForOrigin(options.url))
+      .then(_ => driver.blockUrlPatterns(options.flags.blockedUrlPatterns || []));
   }
 
   static disposeDriver(driver) {
diff --git a/lighthouse-core/test/gather/fake-driver.js b/lighthouse-core/test/gather/fake-driver.js
index 8ecc48c59a3b..6000704fca36 100644
--- a/lighthouse-core/test/gather/fake-driver.js
+++ b/lighthouse-core/test/gather/fake-driver.js
@@ -61,5 +61,8 @@ module.exports = {
     return Promise.resolve({
       schemeIsCryptographic: true
     });
+  },
+  blockUrlPatterns() {
+    return Promise.resolve();
   }
 };