diff --git a/nmigen/compat/genlib/cdc.py b/nmigen/compat/genlib/cdc.py
index 9e25c68..557d573 100644
--- a/nmigen/compat/genlib/cdc.py
+++ b/nmigen/compat/genlib/cdc.py
@@ -2,6 +2,7 @@ from ...tools import deprecated
 from ...lib.cdc import MultiReg
 from ...hdl.ast import *
 from ..fhdl.module import CompatModule
+from ..fhdl.structure import If
 
 
 __all__ = ["MultiReg", "GrayCounter", "GrayDecoder"]