diff --git a/migen/fhdl/tools.py b/migen/fhdl/tools.py
index 2d739077f..fd55034d8 100644
--- a/migen/fhdl/tools.py
+++ b/migen/fhdl/tools.py
@@ -5,11 +5,6 @@ from migen.fhdl.structure import _Slice, _Assign
 from migen.fhdl.visit import NodeVisitor, NodeTransformer
 from migen.fhdl.size import value_bits_sign
 
-def bitreverse(s):
-	length, signed = value_bits_sign(s)
-	l = [s[i] for i in reversed(range(length))]
-	return Cat(*l)
-
 def flat_iteration(l):
 	for element in l:
 		if isinstance(element, collections.Iterable):
diff --git a/migen/genlib/misc.py b/migen/genlib/misc.py
index 97d0be0e0..0e20cab96 100644
--- a/migen/genlib/misc.py
+++ b/migen/genlib/misc.py
@@ -1,6 +1,11 @@
 from migen.fhdl.std import *
 from migen.fhdl.structure import _Operator
 
+def bitreverse(s):
+	length, signed = value_bits_sign(s)
+	l = [s[i] for i in reversed(range(length))]
+	return Cat(*l)
+
 def optree(op, operands, lb=None, ub=None, default=None):
 	if lb is None:
 		lb = 0