Correct FV_MAX_INDEX
diff --git a/src/gflags.cc b/src/gflags.cc
index 9881a80..c4a689d 100644
--- a/src/gflags.cc
+++ b/src/gflags.cc
@@ -213,7 +213,7 @@
     FV_UINT64 = 4,
     FV_DOUBLE = 5,
     FV_STRING = 6,
-    FV_MAX_INDEX = 7,
+    FV_MAX_INDEX = 6,
   };
   const char* TypeName() const;
   bool Equal(const FlagValue& x) const;