diff --git a/include-build/roborazzi-gradle-plugin/src/main/java/io/github/takahirom/roborazzi/WebAssets.kt b/include-build/roborazzi-gradle-plugin/src/main/java/io/github/takahirom/roborazzi/WebAssets.kt
index b0385a1c..2254eaa9 100644
--- a/include-build/roborazzi-gradle-plugin/src/main/java/io/github/takahirom/roborazzi/WebAssets.kt
+++ b/include-build/roborazzi-gradle-plugin/src/main/java/io/github/takahirom/roborazzi/WebAssets.kt
@@ -64,7 +64,7 @@ class WebAssets private constructor(private val webJarVersionLocator: WebJarVers
 
   companion object {
 
-    val assetPathsMap = mapOf(
+   internal val assetPathsMap = mapOf(
       "materializecss" to listOf(
         "css/materialize.min.css",
         "js/materialize.min.js",