diff --git a/src/types.cc b/src/types.cc
index acf91f5..3951a8d 100644
--- a/src/types.cc
+++ b/src/types.cc
@@ -2023,8 +2023,8 @@ namespace SpansReg {
   };
 
   static const luaL_Reg vars_get[] = {
-    { "start", WRAPMEM(T, start) },
-    { "end", WRAPMEM(T, end) },
+    { "_start", WRAPMEM(T, start) },
+    { "_end", WRAPMEM(T, end) },
     { "count", WRAP(count) },
     { NULL, NULL },
   };