diff --git a/lib/BlockDb.js b/lib/BlockDb.js
index a172c0e8..1d30e316 100644
--- a/lib/BlockDb.js
+++ b/lib/BlockDb.js
@@ -283,7 +283,7 @@ BlockDb.prototype.fromHashWithInfo = function(hash, cb) {
     self.getHeight(hash, function(err, height) {
       if (err) return cb(err);
 
-      info.isMainChain = height ? true : false;
+      info.isMainChain = height>=0 ? true : false;
 
       return cb(null, {
         hash: hash,