diff --git a/src/core/org/luaj/vm2/compiler/FuncState.java b/src/core/org/luaj/vm2/compiler/FuncState.java
index 98534d50..70e0f885 100644
--- a/src/core/org/luaj/vm2/compiler/FuncState.java
+++ b/src/core/org/luaj/vm2/compiler/FuncState.java
@@ -479,7 +479,7 @@ public class FuncState extends Constants {
 			return ((Integer) h.get(v)).intValue();
 		}
 		final int idx = this.nk;
-		this.h.put(v, Integer.valueOf(idx));
+		this.h.put(v, new Integer(idx));
 		final Prototype f = this.f;
 		if (f.k == null || nk + 1 >= f.k.length)
 			f.k = realloc( f.k, nk*2 + 1 );