```diff
diff --git a/core/src/main/java/org/jruby/ir/IRClosure.java b/core/src/main/java/org/jruby/ir/IRClosure.java
index 27b4f0c2bc..724ede6d80 100644
--- a/core/src/main/java/org/jruby/ir/IRClosure.java
+++ b/core/src/main/java/org/jruby/ir/IRClosure.java
@@ -204,7 +204,7 @@ public class IRClosure extends IRScope {
         DefNode def = source;
         source = null;
 
-        return new IRMethod(getManager(), getLexicalParent(), def, name, true,  getLine(), getStaticScope(), getFlags().contains(IRFlags.CODE_COVERAGE));
+        return new IRMethod(getManager(), getLexicalParent(), def, name, true,  getLine(), getStaticScope().duplicate(), getFlags().contains(IRFlags.CODE_COVERAGE));
     }
 
     public void setSource(IterNode iter) {
```