diff --git a/src/common.rs b/src/common.rs
index 1d44dc48668..102d1e5a824 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -158,10 +158,6 @@ fn const_to_opt_u128(&self, _v: RValue<'gcc>, _sign_ext: bool) -> Option<u128> {
         None
     }
 
-    fn zst_to_backend(&self, _ty: Type<'gcc>) -> RValue<'gcc> {
-        self.const_undef(self.type_ix(0))
-    }
-
     fn scalar_to_backend(&self, cv: Scalar, layout: abi::Scalar, ty: Type<'gcc>) -> RValue<'gcc> {
         let bitsize = if layout.is_bool() { 1 } else { layout.size(self).bits() };
         match cv {