diff --git a/nac3core/src/codegen/concrete_type.rs b/nac3core/src/codegen/concrete_type.rs
index d52c18bb..8680beee 100644
--- a/nac3core/src/codegen/concrete_type.rs
+++ b/nac3core/src/codegen/concrete_type.rs
@@ -25,6 +25,7 @@ pub struct ConcreteFuncArg {
     pub name: StrRef,
     pub ty: ConcreteType,
     pub default_value: Option<SymbolValue>,
+    pub is_vararg: bool,
 }
 
 #[derive(Clone, Debug)]
@@ -112,6 +113,7 @@ impl ConcreteTypeStore {
                         self.from_unifier_type(unifier, primitives, arg.ty, cache)
                     },
                     default_value: arg.default_value.clone(),
+                    is_vararg: arg.is_vararg,
                 })
                 .collect(),
             ret: self.from_unifier_type(unifier, primitives, signature.ret, cache),
diff --git a/nac3core/src/codegen/expr.rs b/nac3core/src/codegen/expr.rs
index 53e38363..f070e6b2 100644
--- a/nac3core/src/codegen/expr.rs
+++ b/nac3core/src/codegen/expr.rs
@@ -734,7 +734,15 @@ pub fn gen_func_instance<'ctx>(
         let zelf = store.from_unifier_type(&mut ctx.unifier, &ctx.primitives, obj.0, &mut cache);
         let ConcreteTypeEnum::TFunc { args, .. } = &mut signature else { unreachable!() };
 
-        args.insert(0, ConcreteFuncArg { name: "self".into(), ty: zelf, default_value: None });
+        args.insert(
+            0,
+            ConcreteFuncArg {
+                name: "self".into(),
+                ty: zelf,
+                default_value: None,
+                is_vararg: false,
+            },
+        );
     }
     let signature = store.add_cty(signature);
 
diff --git a/nac3core/src/codegen/mod.rs b/nac3core/src/codegen/mod.rs
index cb58f84d..3dd49423 100644
--- a/nac3core/src/codegen/mod.rs
+++ b/nac3core/src/codegen/mod.rs
@@ -702,7 +702,7 @@ pub fn gen_func_impl<
                 name: arg.name,
                 ty: task.store.to_unifier_type(&mut unifier, &primitives, arg.ty, &mut cache),
                 default_value: arg.default_value.clone(),
-                is_vararg: false,
+                is_vararg: arg.is_vararg,
             })
             .collect_vec(),
         task.store.to_unifier_type(&mut unifier, &primitives, *ret, &mut cache),