1 files changed, 4 insertions, 1 deletions
diff --git a/java/src/IceInternal/BasicStream.java b/java/src/IceInternal/BasicStream.java
index 79081979771..3acac5097bf 100644
--- a/java/src/IceInternal/BasicStream.java
+++ b/java/src/IceInternal/BasicStream.java
@@ -1600,7 +1600,10 @@ public class BasicStream
     private String
     typeToClass(String id)
     {
-        assert(id.startsWith("::"));
+        if(!id.startsWith("::"))
+        {
+            throw new Ice.MarshalException();
+        }
         return id.substring(2).replaceAll("::", ".");
     }