diff --git a/src/defineDefaultValues.ts b/src/defineDefaultValues.ts
new file mode 100644
index 0000000..4c860ed
--- /dev/null
+++ b/src/defineDefaultValues.ts
@@ -0,0 +1,8 @@
+import { Opaque } from "type-fest"
+
+
+export type DefinedDefaultValues<T> = Opaque<T, "@thilawyn/schemable-class/DefinedDefaultValues">
+
+export function defineDefaultValues<T>(values: T) {
+    return values as DefinedDefaultValues<T>
+}
diff --git a/src/extendSchemableClass.ts b/src/extendSchemableClass.ts
index 4c92aac..1b1180b 100644
--- a/src/extendSchemableClass.ts
+++ b/src/extendSchemableClass.ts
@@ -1,6 +1,6 @@
 import { AbstractClass, Class as ConcreteClass } from "type-fest"
 import { z } from "zod"
-import { SchemableClass } from "."
+import { DefinedDefaultValues, SchemableClass } from "."
 import { StaticMembers } from "./util"
 
 
@@ -53,7 +53,7 @@ export function extendSchemableClass<
             SchemaValues
         >
 
-        defaultValues: (defaultValues: ExtendDefaultValues) => DefaultValues
+        defaultValues: (defaultValues: ExtendDefaultValues) => DefinedDefaultValues<DefaultValues>
     },
 ) {
     type Class<T, Arguments extends unknown[]> = (
diff --git a/src/index.ts b/src/index.ts
index 7df42bc..4b4c248 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,5 @@
 export * from "./SchemableClass"
+export * from "./defineDefaultValues"
 export * from "./extendSchemableClass"
 export * from "./makeSchemableClass"
 export * from "./newSchemable"
diff --git a/src/makeSchemableClass.ts b/src/makeSchemableClass.ts
index 544dade..0f0c2cf 100644
--- a/src/makeSchemableClass.ts
+++ b/src/makeSchemableClass.ts
@@ -1,5 +1,6 @@
 import { AbstractClass, Class as ConcreteClass } from "type-fest"
 import { z } from "zod"
+import { DefinedDefaultValues } from "."
 import { StaticMembers } from "./util"
 
 
@@ -30,7 +31,7 @@ export function makeSchemableClassFrom<
             Values
         >
 
-        defaultValues: DefaultValues
+        defaultValues: DefinedDefaultValues<DefaultValues>
     },
 ) {
     type Class<T, Arguments extends unknown[]> = (
@@ -88,7 +89,7 @@ export function makeSchemableClass<
             Values
         >
 
-        defaultValues: DefaultValues
+        defaultValues: DefinedDefaultValues<DefaultValues>
     }
 ) {
     return makeSchemableClassFrom(Object, props)
diff --git a/src/tests.ts b/src/tests.ts
index 8cbcee3..e022514 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -1,27 +1,12 @@
 import { pipeInto } from "ts-functional-pipe"
 import { z } from "zod"
-import { extendSchemableClass, makeSchemableClass, newSchemable } from "."
+import { defineDefaultValues, extendSchemableClass, makeSchemableClass, newSchemable } from "."
 import { dejsonifyBigIntSchema, dejsonifySchemable, jsonifyBigIntSchema, makeJsonifiableSchemableClass } from "./jsonifiable"
 
 
 const UserLevel = z.enum(["User", "Admin"])
 
 
-const UserProto = makeSchemableClass({
-    schema: z.object({
-        id:     z.bigint(),
-        name:   z.string(),
-        level:  UserLevel,
-    }),
-
-    defaultValues: {
-        level: "User"
-    } as const,
-})
-
-UserProto.defaultValues
-
-
 class User extends pipeInto(
     makeSchemableClass({
         schema: z.object({
@@ -30,9 +15,9 @@ class User extends pipeInto(
             level:  UserLevel,
         }),
 
-        defaultValues: {
-            level: "User"
-        } as const,
+        defaultValues: defineDefaultValues({
+            level: "User" as const
+        }),
     }),
 
     v => makeJsonifiableSchemableClass(v, {
@@ -46,6 +31,8 @@ class User extends pipeInto(
     }),
 ) {}
 
+User.defaultValues
+
 
 const user1 = newSchemable(User, { id: 1n, name: "User" })
 const jsonifiedUser1 = user1.jsonify()