diff --git a/control/gen-fan-zone-defs.py b/control/gen-fan-zone-defs.py
index baa0f9b..f30a1a7 100755
--- a/control/gen-fan-zone-defs.py
+++ b/control/gen-fan-zone-defs.py
@@ -114,8 +114,7 @@
         # of each tuple and ignore possible parameters
         result += ", ".join([e[0] for e in rest])
     else:
-        result += ", ".join(map(lambda e: get_cpp_type(e),
-                                rest))
+        result += ", ".join([get_cpp_type(e) for e in rest])
     result += '>'
 
     return result