diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json b/spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json
index 833e330458..50d805ff76 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json
@@ -374,7 +374,7 @@
   },
   {
     "name": "spring.mustache.suffix",
-    "defaultValue": ".html"
+    "defaultValue": ".mustache"
   },
   {
     "name": "spring.mvc.favicon.enabled",