diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index 072910e30..2b28f3232 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -893,8 +893,8 @@ DEF_METHOD(addXor,      "$xor")
 DEF_METHOD(addXnor,     "$xnor")
 DEF_METHOD(addShl,      "$shl")
 DEF_METHOD(addShr,      "$shr")
-DEF_METHOD(addSshl,     "$Sshl")
-DEF_METHOD(addSshr,     "$Sshr")
+DEF_METHOD(addSshl,     "$sshl")
+DEF_METHOD(addSshr,     "$sshr")
 DEF_METHOD(addLt,       "$lt")
 DEF_METHOD(addLe,       "$le")
 DEF_METHOD(addEq,       "$eq")