diff --git a/java_gen/templates/const_set_serializer.java b/java_gen/templates/const_set_serializer.java
index 641b0c8..ad0adb1 100644
--- a/java_gen/templates/const_set_serializer.java
+++ b/java_gen/templates/const_set_serializer.java
@@ -82,6 +82,7 @@
                 //:: for entry, _ in entries:
                 case ${entry.name}:
                     wireValue |= ${entry.name}_VAL;
+                    break;
                 //:: #endfor
                 default:
                     throw new IllegalArgumentException("Illegal enum value for type ${enum.name} in version ${version}: " + e);