diff --git a/src/core/org/luaj/vm2/lib/LibFunction.java b/src/core/org/luaj/vm2/lib/LibFunction.java
index 1585285b..b537dab4 100644
--- a/src/core/org/luaj/vm2/lib/LibFunction.java
+++ b/src/core/org/luaj/vm2/lib/LibFunction.java
@@ -139,7 +139,7 @@ abstract public class LibFunction extends LuaFunction {
 	}
 	
 	public String tojstring() {
-		return name != null? name: super.tojstring();
+		return name != null ? "function: " + name : super.tojstring();
 	}
 	
 	/**