diff --git a/backup.py b/backup.py
index bbef16f..f0281fb 100755
--- a/backup.py
+++ b/backup.py
@@ -140,6 +140,7 @@ class Backup:
             st = os.lstat(path)
             is_dir = stat.S_ISDIR(st.st_mode)
             is_reg = stat.S_ISREG(st.st_mode)
+            size = st.st_blocks * 512
 
             # Decorated path ends with a '/' if it's a directory.
             decorated_path = path
@@ -160,14 +161,14 @@ class Backup:
                 # Crosses a mount point
                 exclude_reason = ('I', "skipping, on different filesystem")
 
-            elif (self.config.max_file_size
-                  and is_reg
-                  and (st.st_blocks * 512) > self.config.max_file_size):
+            elif (is_reg
+                  and self.config.max_file_size
+                  and size > self.config.max_file_size):
                 # Too big
                 def format_size(n):
                     return humanfriendly.format_size(
                         n, keep_width=True, binary=True)
-                a = format_size(st.st_blocks * 512)
+                a = format_size(size)
                 b = format_size(self.config.max_file_size)
                 exclude_reason = ('W', f"file size {a} exceeds limit {b}")