diff --git a/src/machine.h b/src/machine.h
index a9f6122e97..2aaa2ad098 100644
--- a/src/machine.h
+++ b/src/machine.h
@@ -138,8 +138,8 @@ enum StackTag {
   ObjectTag
 };
 
-const int NativeLine = -1;
-const int UnknownLine = -2;
+const int NativeLine = -2;
+const int UnknownLine = -1;
 
 // class vmFlags:
 const unsigned ReferenceFlag = 1 << 0;