diff --git a/litex_boards/platforms/sipeed_tang_nano_4k.py b/litex_boards/platforms/sipeed_tang_nano_4k.py
index 6d78a5f..f31bb4e 100644
--- a/litex_boards/platforms/sipeed_tang_nano_4k.py
+++ b/litex_boards/platforms/sipeed_tang_nano_4k.py
@@ -85,6 +85,7 @@ _connectors = [
 class Platform(GowinPlatform):
     default_clk_name = "clk27"
     default_clk_freq = 27e6
+    default_clk_period = 1e9 / default_clk_freq
 
     def __init__(self):
         GowinPlatform.__init__(self, "GW1NSR-LV4CQN48PC7/I6", _io, _connectors, toolchain="gowin", devicename="GW1NSR-4C")
@@ -95,6 +96,6 @@ class Platform(GowinPlatform):
     def create_programmer(self):
         return OpenFPGALoader("tangnano4k")
 
-    def do_finalize(self, fragment):
-        GowinPlatform.do_finalize(self, fragment)
+    def do_finalize(self, fragment, *args, **kwargs):
+        GowinPlatform.do_finalize(self, fragment, *args, **kwargs)
         self.add_period_constraint(self.lookup_request("clk27", loose=True), 1e9 / self.default_clk_freq)