diff --git a/QRCodeService/Services/ShortCodeService.cs b/QRCodeService/Services/ShortCodeService.cs
index 61cbee4..a204e05 100644
--- a/QRCodeService/Services/ShortCodeService.cs
+++ b/QRCodeService/Services/ShortCodeService.cs
@@ -59,7 +59,7 @@ namespace QRCodeService.Services
                 }
                 if(length == 8)
                 {
-                    return BitConverter.ToInt32(result, 8 * index).ToBase62();
+                    return BitConverter.ToInt64(result, 8 * index).ToBase62();
                 }
                 if(length == 16)
                 {