diff --git a/proto/ei-scanner b/proto/ei-scanner
index ca11203..ae42b0c 100755
--- a/proto/ei-scanner
+++ b/proto/ei-scanner
@@ -277,8 +277,11 @@ class Enum:
             if self.is_bitfield:
                 if e.value < 0:
                     raise ValueError("Bitmasks must not be less than zero")
-                if e.value.bit_count() > 1:
-                    raise ValueError("Bitmasks must have exactly one bit set")
+                try:
+                    if e.value.bit_count() > 1:
+                        raise ValueError("Bitmasks must have exactly one bit set")
+                except AttributeError:
+                    pass  # bit_count() requires Python 3.10
 
         self.entries.append(entry)