diff --git a/src/python/m5/params.py b/src/python/m5/params.py
index b7df7c660..7dc443b2d 100644
--- a/src/python/m5/params.py
+++ b/src/python/m5/params.py
@@ -638,7 +638,7 @@ class Cycles(CheckedInt):
 
 class Float(ParamValue, float):
     cxx_type = 'double'
-    cmdLineSettable = True
+    cmd_line_settable = True
 
     def __init__(self, value):
         if isinstance(value, (int, long, float, NumericParamValue, Float, str)):