diff --git a/nmigen/hdl/mem.py b/nmigen/hdl/mem.py
index 2111ecc..45836cb 100644
--- a/nmigen/hdl/mem.py
+++ b/nmigen/hdl/mem.py
@@ -27,7 +27,8 @@ class Memory:
         self._array = Array()
         if simulate:
             for addr in range(self.depth):
-                self._array.append(Signal(self.width, name="{}({})".format(name, addr)))
+                self._array.append(Signal(self.width, name="{}({})"
+                                          .format(name or "memory", addr)))
 
         self.init = init