diff --git a/src/Schema/toJsonifiable.ts b/src/Schema/toJsonifiable.ts
index 0112b3e..c7b0a4f 100644
--- a/src/Schema/toJsonifiable.ts
+++ b/src/Schema/toJsonifiable.ts
@@ -10,4 +10,4 @@ export const toJsonifiable = <
     jsonifiableSchema: Schema.Schema<JsonifiableA, JsonifiableI, JsonifiableR>
 ) =>
     <A, R>(decodedSchema: Schema.Schema<A, JsonifiableA, R>) =>
-        Schema.compose(jsonifiableSchema, decodedSchema)
+        Schema.compose(jsonifiableSchema, decodedSchema, { strict: true })