diff --git a/QRCoder/QRCodeGenerator.cs b/QRCoder/QRCodeGenerator.cs
index 3d76f5a9..02ea4193 100644
--- a/QRCoder/QRCodeGenerator.cs
+++ b/QRCoder/QRCodeGenerator.cs
@@ -179,7 +179,7 @@ public static QRCodeData GenerateQrCode(byte[] binaryData, ECCLevel eccLevel)
                 sb.Append(DecToBin(b, 8));
 
             }
-            bitString = sb.ToString();
+            string bitString = sb.ToString();
 
 
             return GenerateQrCode(bitString, eccLevel, version);