diff --git a/main.go b/main.go
index 5d31350..9e42e8a 100644
--- a/main.go
+++ b/main.go
@@ -310,6 +310,7 @@ func licenseHeader(path string, tmpl *template.Template, data licenseData) ([]by
 		".dart",
 		".go",
 		".groovy",
+		".gradle",
 		".hcl",
 		".m", ".mm",
 		".php",
diff --git a/main_test.go b/main_test.go
index ffd25ef..5aa7648 100644
--- a/main_test.go
+++ b/main_test.go
@@ -332,6 +332,7 @@ func TestLicenseHeader(t *testing.T) {
 				"f.dart",
 				"f.go",
 				"f.groovy",
+				"f.gradle",
 				"f.hcl",
 				"f.m", "f.mm",
 				"f.php",
diff --git a/testdata/expected/file.gradle b/testdata/expected/file.gradle
new file mode 100644
index 0000000..42e27e2
--- /dev/null
+++ b/testdata/expected/file.gradle
@@ -0,0 +1,17 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+application {
+  mainClass = 'com.google.helloworld'
+}
diff --git a/testdata/initial/file.gradle b/testdata/initial/file.gradle
new file mode 100644
index 0000000..6279580
--- /dev/null
+++ b/testdata/initial/file.gradle
@@ -0,0 +1,3 @@
+application {
+  mainClass = 'com.google.helloworld'
+}