diff --git a/passes/opt/peepopt.cc b/passes/opt/peepopt.cc
index 625c261fc..c2597cbfc 100644
--- a/passes/opt/peepopt.cc
+++ b/passes/opt/peepopt.cc
@@ -136,13 +136,4 @@ struct PeepoptPass : public Pass {
 	}
 } PeepoptPass;
 
-
-SigSpec remove_bottom_padding(SigSpec sig)
-{
-	int i = 0;
-	for (; i < sig.size() - 1 && sig[i] == State::S0; i++) {
-	}
-	return sig.extract(i, sig.size() - i);
-}
-
 PRIVATE_NAMESPACE_END