diff --git a/src/effect/schema/class/Mutable.ts b/src/effect/schema/class/Mutable.ts
index 566a16f..f734bca 100644
--- a/src/effect/schema/class/Mutable.ts
+++ b/src/effect/schema/class/Mutable.ts
@@ -21,7 +21,7 @@ export function Mutable<
         Constructor<
             Omit<
                 InstanceType<This>,
-                keyof InstanceType<TMutableClass<Self, Fields, I, R, C, Inherited, Proto>>
+                keyof InstanceType<Class<Self, Fields, I, R, C, Inherited, Proto>>
             > &
             InstanceType<TMutableClass<Self, Fields, I, R, C, Inherited, Proto>>,
 
@@ -30,7 +30,7 @@ export function Mutable<
 
         Omit<
             StaticType<This>,
-            keyof StaticType<TMutableClass<Self, Fields, I, R, C, Inherited, Proto>>
+            keyof StaticType<Class<Self, Fields, I, R, C, Inherited, Proto>>
         > &
         StaticType<TMutableClass<Self, Fields, I, R, C, Inherited, Proto>>
     )