diff --git a/magick/blob.c b/magick/blob.c
index 6114cc2..a3adbc2 100644
--- a/magick/blob.c
+++ b/magick/blob.c
@@ -3517,7 +3517,7 @@
       break;
     case FileStream:
     {
-      if (fseek(image->blob->file,(long) offset,whence) < 0)
+      if (fseek(image->blob->file,offset,whence) < 0)
         return(-1);
       image->blob->offset=TellBlob(image);
       break;