diff --git a/lite/provider.go b/lite/provider.go
index 3574c52d..ab94cdc7 100644
--- a/lite/provider.go
+++ b/lite/provider.go
@@ -111,7 +111,7 @@ func (cp concurrentProvider) joinConcurrency(chainID string, height int64) (uniq
 	}
 }
 
-func (cp concurrentProvider) UpdateToHeight(chainID string, height int64) error {
+func (cp *concurrentProvider) UpdateToHeight(chainID string, height int64) error {
 
 	// Performs synchronization for multi-threads verification at the same height.
 	var presult *pendingResult
diff --git a/types/block.go b/types/block.go
index b620191e..8a8989ab 100644
--- a/types/block.go
+++ b/types/block.go
@@ -412,7 +412,7 @@ func (h *Header) Equal(h2 *Header) bool {
 		panic("incomplete heaeders cannot be compared")
 	}
 	h2Hash := h2.Hash()
-	return bytes.Compare(h1Hash, h2Hash) == 0
+	return bytes.Equal(h1Hash, h2Hash)
 }
 
 // Hash returns the hash of the header.
@@ -708,7 +708,7 @@ func (commit *Commit) Equal(commit2 *Commit) bool {
 		panic("incomplete commit cannot be compared")
 	}
 	c2Hash := commit2.Hash()
-	return bytes.Compare(c1Hash, c2Hash) == 0
+	return bytes.Equal(c1Hash, c2Hash)
 }
 
 // Hash returns the hash of the commit