diff --git a/src/jpeglib/_bind.py b/src/jpeglib/_bind.py
index b8d5891..7d353f2 100644
--- a/src/jpeglib/_bind.py
+++ b/src/jpeglib/_bind.py
@@ -155,7 +155,6 @@ def read_jpeg_spatial(
         if path is None:
             path = srcfile
 
-        flag_mask = cls.flags_to_mask(flags)
         status = cls.get().read_jpeg_spatial(
             cls.cstr(srcfile),
             spatial,
@@ -164,9 +163,9 @@ def read_jpeg_spatial(
             out_color_space,
             dither_mode,
             dct_method,
-            flag_mask
+            cls.flags_to_mask(flags)
         )
-        
+
         if status == 0:
             raise IOError(f"reading of {path} spatial failed")