diff --git a/tools/mkssldef.py b/tools/mkssldef.py
index 3ff53531667417..4768d1ff0ff699 100755
--- a/tools/mkssldef.py
+++ b/tools/mkssldef.py
@@ -21,13 +21,13 @@
     elif option.startswith('-X'): excludes += option[2:].split(',')
     elif option.startswith('-B'): bases += option[2:].split(',')
 
-  excludes = map(re.compile, excludes)
+  excludes = [re.compile(exclude) for exclude in excludes]
   exported = []
 
   for filename in filenames:
     for line in open(filename).readlines():
       name, _, _, meta, _ = re.split('\s+', line)
-      if any(map(lambda p: p.match(name), excludes)): continue
+      if any(p.match(name) for p in excludes): continue
       meta = meta.split(':')
       assert meta[0] in ('EXIST', 'NOEXIST')
       assert meta[2] in ('FUNCTION', 'VARIABLE')