diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index 7e1159cac..dd6817873 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -3456,7 +3456,7 @@ bool RTLIL::SigSpec::operator ==(const RTLIL::SigSpec &other) const
 	pack();
 	other.pack();
 
-	if (chunks_.size() != chunks_.size())
+	if (chunks_.size() != other.chunks_.size())
 		return false;
 
 	updhash();