diff --git a/wire-gradle-plugin/src/main/kotlin/com/squareup/wire/gradle/WireInput.kt b/wire-gradle-plugin/src/main/kotlin/com/squareup/wire/gradle/WireInput.kt
index 45b09635a4..9b8fe80ebf 100644
--- a/wire-gradle-plugin/src/main/kotlin/com/squareup/wire/gradle/WireInput.kt
+++ b/wire-gradle-plugin/src/main/kotlin/com/squareup/wire/gradle/WireInput.kt
@@ -65,8 +65,8 @@ internal fun InputLocation.toLocations(
         |For individual files, use the following syntax:
         |wire {
         |  sourcePath {
-        |    srcDir 'dirPath'
-        |    include 'relativePath'
+        |    srcDir("dirPath")
+        |    include("relativePath")
         |  }
         |}
         """.trimMargin(),
diff --git a/wire-gradle-plugin/src/test/kotlin/com/squareup/wire/gradle/WirePluginTest.kt b/wire-gradle-plugin/src/test/kotlin/com/squareup/wire/gradle/WirePluginTest.kt
index bfcf8204d5..3c8abb2bc6 100644
--- a/wire-gradle-plugin/src/test/kotlin/com/squareup/wire/gradle/WirePluginTest.kt
+++ b/wire-gradle-plugin/src/test/kotlin/com/squareup/wire/gradle/WirePluginTest.kt
@@ -182,8 +182,8 @@ class WirePluginTest {
         |For individual files, use the following syntax:
         |wire {
         |  sourcePath {
-        |    srcDir 'dirPath'
-        |    include 'relativePath'
+        |    srcDir("dirPath")
+        |    include("relativePath")
         |  }
         |}
         """.trimMargin().withPlatformSlashes(),