diff --git a/packages/common/src/service.js b/packages/common/src/service.js
index 1765f330fab..a61fb925c41 100644
--- a/packages/common/src/service.js
+++ b/packages/common/src/service.js
@@ -115,8 +115,10 @@ Service.prototype.request_ = function(reqOpts, callback) {
 
   delete reqOpts.interceptors_;
 
+  var pkg = this.packageJson;
   reqOpts.headers = extend({}, reqOpts.headers, {
-    'User-Agent': util.getUserAgentFromPackageJson(this.packageJson)
+    'User-Agent': util.getUserAgentFromPackageJson(pkg),
+    'x-goog-api-client': `gl-node/${process.versions.node} gccl/${pkg.version}`
   });
 
   return this.makeAuthenticatedRequest(reqOpts, callback);
diff --git a/packages/common/test/service.js b/packages/common/test/service.js
index f75ca5fb7eb..74d4bc10233 100644
--- a/packages/common/test/service.js
+++ b/packages/common/test/service.js
@@ -254,6 +254,19 @@ describe('Service', function() {
       service.request_(reqOpts, assert.ifError);
     });
 
+    it('should add the api-client header', function(done) {
+      service.makeAuthenticatedRequest = function(reqOpts) {
+        var pkg = service.packageJson;
+        assert.strictEqual(
+          reqOpts.headers['x-goog-api-client'],
+          `gl-node/${process.versions.node} gccl/${pkg.version}`
+        );
+        done();
+      };
+
+      service.request_(reqOpts, assert.ifError);
+    });
+
     describe('projectIdRequired', function() {
       describe('false', function() {
         it('should include the projectId', function(done) {