diff --git a/src/vm/wren_core.c b/src/vm/wren_core.c
index 28f3cafc..cf4c0eee 100644
--- a/src/vm/wren_core.c
+++ b/src/vm/wren_core.c
@@ -234,46 +234,28 @@ DEF_PRIMITIVE(fn_toString)
   RETURN_VAL(CONST_STRING(vm, "<fn>"));
 }
 
+// Creates a new list of size args[1], with all elements initialized to args[2].
+DEF_PRIMITIVE(list_filled)
+{
+  if (!validateInt(vm, args[1], "Size")) return false;  
+  if (AS_NUM(args[1]) < 0) RETURN_ERROR("Size cannot be negative.");
+  
+  uint32_t size = (uint32_t)AS_NUM(args[1]);
+  ObjList* list = wrenNewList(vm, size);
+  
+  for (uint32_t i = 0; i < size; i++)
+  {
+    list->elements.data[i] = args[2];
+  }
+  
+  RETURN_OBJ(list);
+}
+
 DEF_PRIMITIVE(list_new)
 {
   RETURN_OBJ(wrenNewList(vm, 0));
 }
 
-//creates a new list of size args[1], with all elements initilized to null
-DEF_PRIMITIVE(list_newWithSize)
-{
-  if(!validateInt(vm, args[1], "Size")) return false;
-
-  uint32_t size = (uint32_t)AS_NUM(args[1]);
-  ObjList* list = wrenNewList(vm, size);
-
-  for(uint32_t i=0; i < size; i++)
-  {
-    list->elements.data[i] = NULL_VAL;
-  }
-
-  RETURN_OBJ(list);
-}
-
-
-//creates a new list of size args[1], with all elements initilized to args[2]
-DEF_PRIMITIVE(list_newWithSizeDefault)
-{
-  if(!validateInt(vm, args[1], "Size")) return false;
-
-  uint32_t size = (uint32_t)AS_NUM(args[1]);
-
-  ObjList* list = wrenNewList(vm, size);
-
-  for(uint32_t i=0; i < size; i++)
-  {
-    list->elements.data[i] = args[2];
-  }
-
-  RETURN_OBJ(list);
-}
-
-
 DEF_PRIMITIVE(list_add)
 {
   wrenValueBufferWrite(vm, &AS_LIST(args[0])->elements, args[1]);
@@ -1308,9 +1290,8 @@ void wrenInitializeCore(WrenVM* vm)
   PRIMITIVE(vm->stringClass, "toString", string_toString);
 
   vm->listClass = AS_CLASS(wrenFindVariable(vm, coreModule, "List"));
+  PRIMITIVE(vm->listClass->obj.classObj, "filled(_,_)", list_filled);
   PRIMITIVE(vm->listClass->obj.classObj, "new()", list_new);
-  PRIMITIVE(vm->listClass->obj.classObj, "new(_)", list_newWithSize);
-  PRIMITIVE(vm->listClass->obj.classObj, "filled(_,_)", list_newWithSizeDefault);
   PRIMITIVE(vm->listClass, "[_]", list_subscript);
   PRIMITIVE(vm->listClass, "[_]=(_)", list_subscriptSetter);
   PRIMITIVE(vm->listClass, "add(_)", list_add);
diff --git a/test/core/list/filled.wren b/test/core/list/filled.wren
new file mode 100644
index 00000000..e8e5cdda
--- /dev/null
+++ b/test/core/list/filled.wren
@@ -0,0 +1,8 @@
+var list = List.filled(3, "value")
+System.print(list.count) // expect: 3
+System.print(list) // expect: [value, value, value]
+
+// Can create an empty list.
+list = List.filled(0, "value")
+System.print(list.count) // expect: 0
+System.print(list) // expect: []
diff --git a/test/core/list/filled_size_negative.wren b/test/core/list/filled_size_negative.wren
new file mode 100644
index 00000000..acdeb38a
--- /dev/null
+++ b/test/core/list/filled_size_negative.wren
@@ -0,0 +1 @@
+List.filled(-1, null) // expect runtime error: Size cannot be negative.
diff --git a/test/core/list/filled_size_not_int.wren b/test/core/list/filled_size_not_int.wren
new file mode 100644
index 00000000..989e7953
--- /dev/null
+++ b/test/core/list/filled_size_not_int.wren
@@ -0,0 +1 @@
+List.filled(1.2, null) // expect runtime error: Size must be an integer.
diff --git a/test/core/list/filled_size_not_num.wren b/test/core/list/filled_size_not_num.wren
new file mode 100644
index 00000000..93fd4534
--- /dev/null
+++ b/test/core/list/filled_size_not_num.wren
@@ -0,0 +1 @@
+List.filled("not num", null) // expect runtime error: Size must be a number.
diff --git a/test/core/list/new_extra_args.wren b/test/core/list/new_extra_args.wren
deleted file mode 100644
index 1fc236e9..00000000
--- a/test/core/list/new_extra_args.wren
+++ /dev/null
@@ -1,8 +0,0 @@
-var list = List.new(5)
-
-System.print(list.count) // expect: 5
-System.print(list) // expect: [null, null, null, null, null]
-
-var list2 = List.filled(5, 2)
-System.print(list2.count) // expect: 5
-System.print(list2) // expect: [2, 2, 2, 2, 2]