diff --git a/common/src/main/java/org/keycloak/common/util/MimeTypeUtil.java b/common/src/main/java/org/keycloak/common/util/MimeTypeUtil.java
index bb602e196fc..80646186aae 100644
--- a/common/src/main/java/org/keycloak/common/util/MimeTypeUtil.java
+++ b/common/src/main/java/org/keycloak/common/util/MimeTypeUtil.java
@@ -29,7 +29,7 @@ public class MimeTypeUtil {
     static {
         map.addMimeTypes("text/css css CSS");
         map.addMimeTypes("text/javascript js JS");
-        map.addMimeTypes("text/javascript js JS");
+        map.addMimeTypes("application/json json JSON");
         map.addMimeTypes("image/png png PNG");
         map.addMimeTypes("image/svg+xml svg SVG");
         map.addMimeTypes("text/html html htm HTML HTM");