diff --git a/litex/soc/interconnect/wishbone.py b/litex/soc/interconnect/wishbone.py
index 235e14a3c..d61edbea1 100644
--- a/litex/soc/interconnect/wishbone.py
+++ b/litex/soc/interconnect/wishbone.py
@@ -35,7 +35,7 @@ _layout = [
 
 
 class Interface(Record):
-    def __init__(self, data_width=32, adr_width=31):
+    def __init__(self, data_width=32, adr_width=30):
         self.data_width = data_width
         self.adr_width  = adr_width
         Record.__init__(self, set_layout_parameters(_layout,