diff --git a/QRCodeEncoder.cs b/QRCodeEncoder.cs
index 6e731a9..84091ba 100644
--- a/QRCodeEncoder.cs
+++ b/QRCodeEncoder.cs
@@ -480,11 +480,11 @@ namespace ThoughtWorks.QRCode.Codec
 			}
 			
 			sbyte rsBlockOrderLength = 1;
-			for (sbyte i = 1; i < 128; i++)
+			for (int i = 1; i < 128; i++)
 			{
 				if (rsBlockOrderTemp[i] == 0)
 				{
-					rsBlockOrderLength = i;
+					rsBlockOrderLength = (sbyte)i;
 					break;
 				}
 			}