diff --git a/src/main/java/the/bytecode/club/bytecodeviewer/resources/ResourceContainer.java b/src/main/java/the/bytecode/club/bytecodeviewer/resources/ResourceContainer.java
index 512772b4..c1b36e25 100644
--- a/src/main/java/the/bytecode/club/bytecodeviewer/resources/ResourceContainer.java
+++ b/src/main/java/the/bytecode/club/bytecodeviewer/resources/ResourceContainer.java
@@ -129,7 +129,8 @@ public class ResourceContainer
     public ResourceContainer updateClassNodeBytes()
     {
         resourceClassBytes.clear();
-        resourceClasses.forEach((s, cn) -> resourceClassBytes.put(s, ASMUtil.nodeToBytes(cn)));
+        resourceClasses.forEach((s, cn) ->
+                    resourceClassBytes.put(s+".class", ASMUtil.nodeToBytes(cn)));
         return this;
     }