diff --git a/misoclib/soc/__init__.py b/misoclib/soc/__init__.py
index e17f7c5a3..03f852beb 100644
--- a/misoclib/soc/__init__.py
+++ b/misoclib/soc/__init__.py
@@ -193,6 +193,3 @@ class SoC(Module):
 		if margin:
 			t += clk_period_ns/2
 		return ceil(t/clk_period_ns)
-
-	def do_exit(self, vns):
-		pass