diff --git a/packages/quicktype-core/src/language/TypeScriptEffectSchema/TypeScriptEffectSchemaRenderer.ts b/packages/quicktype-core/src/language/TypeScriptEffectSchema/TypeScriptEffectSchemaRenderer.ts
index 2726f2f81b..f6b0cc2d92 100644
--- a/packages/quicktype-core/src/language/TypeScriptEffectSchema/TypeScriptEffectSchemaRenderer.ts
+++ b/packages/quicktype-core/src/language/TypeScriptEffectSchema/TypeScriptEffectSchemaRenderer.ts
@@ -210,9 +210,13 @@ export class TypeScriptEffectSchemaRenderer extends ConvenienceRenderer {
         const pattern = patternForType(t);
         const schema: Sourcelike[] = ["S.String"];
         if (min !== undefined)
-            schema.push(".pipe(S.minLength(", min.toString(), "))");
+            schema.push(
+                `.pipe(S.filter(value => Array.from(value).length >= ${min}))`,
+            );
         if (max !== undefined)
-            schema.push(".pipe(S.maxLength(", max.toString(), "))");
+            schema.push(
+                `.pipe(S.filter(value => Array.from(value).length <= ${max}))`,
+            );
         if (pattern !== undefined)
             schema.push(
                 `.pipe(S.pattern(new RegExp(${JSON.stringify(pattern)})))`,
diff --git a/test/languages.ts b/test/languages.ts
index ea410d32e1..0c8ad13f3a 100644
--- a/test/languages.ts
+++ b/test/languages.ts
@@ -1745,6 +1745,9 @@ export const TypeScriptEffectSchemaLanguage: Language = {
     topLevel: "TopLevel",
     skipJSON: [],
     skipMiscJSON: false,
+    additionalSchemaFiles: [
+        "test/inputs/regressions/unicode-codepoint-length.schema",
+    ],
     skipSchema: [],
     rendererOptions: {},
     quickTestRendererOptions: [],