diff --git a/nmigen/back/rtlil.py b/nmigen/back/rtlil.py
index fb60003..c074a97 100644
--- a/nmigen/back/rtlil.py
+++ b/nmigen/back/rtlil.py
@@ -644,7 +644,7 @@ class _LHSValueCompiler(_ValueCompiler):
             # system resources.
             max_branches = len(value.value) // value.stride + 1
             raise LegalizeValue(value.offset,
-                                range((1 << len(value.offset)) // value.stride)[:max_branches],
+                                range(1 << len(value.offset))[:max_branches],
                                 value.src_loc)
 
     def on_Repl(self, value):