diff --git a/bam/blend/blendfile.py b/bam/blend/blendfile.py
index e471bea..2b4c95c 100644
--- a/bam/blend/blendfile.py
+++ b/bam/blend/blendfile.py
@@ -71,7 +71,7 @@ def open_blend(filename, access="rb"):
             log.debug("decompressing finished")
             fs.close()
             log.debug("resetting decompressed file")
-            handle.seek(os.SEEK_SET, 0)
+            handle.seek(0, os.SEEK_SET)
             bfile = BlendFile(handle)
             bfile.is_compressed = True
             bfile.filepath_orig = filename
@@ -183,7 +183,7 @@ class BlendFile:
         if self.is_modified:
             if self.is_compressed:
                 log.debug("close compressed blend file")
-                handle.seek(os.SEEK_SET, 0)
+                handle.seek(0, os.SEEK_SET)
                 log.debug("compressing started")
                 fs = gzip.open(self.filepath_orig, "wb")
                 data = handle.read(FILE_BUFFER_SIZE)