diff --git a/packages/quicktype-core/src/language/Kotlin/KotlinKlaxonRenderer.ts b/packages/quicktype-core/src/language/Kotlin/KotlinKlaxonRenderer.ts
index 5820f80ab..b982f5f9a 100644
--- a/packages/quicktype-core/src/language/Kotlin/KotlinKlaxonRenderer.ts
+++ b/packages/quicktype-core/src/language/Kotlin/KotlinKlaxonRenderer.ts
@@ -1,6 +1,7 @@
 import { arrayIntercalate, iterableSome } from "collection-utils";
 
 import {
+    minMaxItemsForType,
     minMaxLengthForType,
     minMaxValueForType,
 } from "../../attributes/Constraints.js";
@@ -413,6 +414,17 @@ export class KotlinKlaxonRenderer extends KotlinRenderer {
                         minMaxLengthForType(p.type) ?? [];
                     if (minLength !== undefined) emitLength(">=", minLength);
                     if (maxLength !== undefined) emitLength("<=", maxLength);
+                    const array = p.isOptional
+                        ? `${value}?.let { require(it.size`
+                        : `require(${value}.size`;
+                    const emitItems = (operator: string, bound: number) =>
+                        emitValidation(
+                            `${array} ${operator} ${bound}${p.isOptional ? ") }" : ")"}`,
+                        );
+                    const [minItems, maxItems] =
+                        minMaxItemsForType(p.type) ?? [];
+                    if (minItems !== undefined) emitItems(">=", minItems);
+                    if (maxItems !== undefined) emitItems("<=", maxItems);
                 });
                 this.emitLine(
                     "public fun toJson() = klaxon.toJsonString(this)",
diff --git a/test/languages.ts b/test/languages.ts
index 6120bb258..6a8dc9e63 100644
--- a/test/languages.ts
+++ b/test/languages.ts
@@ -1255,6 +1255,7 @@ export const KotlinLanguage: Language = {
         "minmax",
         "minmaxInteger",
         "minmaxlength",
+        "minmaxitems",
     ],
     output: "TopLevel.kt",
     topLevel: "TopLevel",