diff --git a/src/core/org/luaj/vm/LValue.java b/src/core/org/luaj/vm/LValue.java
index dce05f83..011099eb 100644
--- a/src/core/org/luaj/vm/LValue.java
+++ b/src/core/org/luaj/vm/LValue.java
@@ -68,7 +68,7 @@ public class LValue {
 
 	// unsupported except for numbers
 	public LValue luaBinOpUnknown(int opcode, LValue lhs) {
-		return arithmeticError(lhs.luaGetTypeName());
+		return arithmeticError(luaGetTypeName());
 	}
 
 	// unsupported except for numbers