diff --git a/.changeset/big-trees-hide.md b/.changeset/big-trees-hide.md
new file mode 100644
index 00000000..aef5d436
--- /dev/null
+++ b/.changeset/big-trees-hide.md
@@ -0,0 +1,5 @@
+---
+'@hey-api/openapi-ts': patch
+---
+
+fix: correctly generate array when items are a oneOf array with length 1
diff --git a/packages/openapi-ts/src/openApi/3.0.x/parser/schema.ts b/packages/openapi-ts/src/openApi/3.0.x/parser/schema.ts
index 5049d481..0fb81cbc 100644
--- a/packages/openapi-ts/src/openApi/3.0.x/parser/schema.ts
+++ b/packages/openapi-ts/src/openApi/3.0.x/parser/schema.ts
@@ -81,10 +81,9 @@ const parseArray = ({
       if ('$ref' in schema.items) {
         schemaItems.push(irItemsSchema);
       } else {
-        const isComposedSchema = Boolean(
-          schema.items.allOf || schema.items.anyOf || schema.items.oneOf,
-        );
-        if (isComposedSchema) {
+        const ofArray =
+          schema.items.allOf || schema.items.anyOf || schema.items.oneOf;
+        if (ofArray && ofArray.length > 1 && !schema.items.nullable) {
           // bring composition up to avoid incorrectly nested arrays
           irSchema = {
             ...irSchema,
diff --git a/packages/openapi-ts/src/openApi/3.1.x/parser/schema.ts b/packages/openapi-ts/src/openApi/3.1.x/parser/schema.ts
index cdc12491..d42a2bf6 100644
--- a/packages/openapi-ts/src/openApi/3.1.x/parser/schema.ts
+++ b/packages/openapi-ts/src/openApi/3.1.x/parser/schema.ts
@@ -120,10 +120,13 @@ const parseArray = ({
     ) {
       schemaItems = Array(schema.maxItems).fill(irItemsSchema);
     } else {
-      const isComposedSchema = Boolean(
-        schema.items.allOf || schema.items.anyOf || schema.items.oneOf,
-      );
-      if (isComposedSchema) {
+      const ofArray =
+        schema.items.allOf || schema.items.anyOf || schema.items.oneOf;
+      if (
+        ofArray &&
+        ofArray.length > 1 &&
+        !getSchemaTypes({ schema: schema.items }).includes('null')
+      ) {
         // bring composition up to avoid incorrectly nested arrays
         irSchema = {
           ...irSchema,
diff --git a/packages/openapi-ts/test/3.0.x.spec.ts b/packages/openapi-ts/test/3.0.x.spec.ts
index 418a7766..6d758378 100644
--- a/packages/openapi-ts/test/3.0.x.spec.ts
+++ b/packages/openapi-ts/test/3.0.x.spec.ts
@@ -48,6 +48,14 @@ describe(`OpenAPI ${VERSION}`, () => {
       }),
       description: 'allows arbitrary properties on objects',
     },
+    {
+      config: createConfig({
+        input: 'array-items-one-of-length-1.json',
+        output: 'array-items-one-of-length-1',
+      }),
+      description:
+        'generates correct array when items are oneOf array with single item',
+    },
     {
       config: createConfig({
         input: 'enum-escape.json',
diff --git a/packages/openapi-ts/test/3.1.x.spec.ts b/packages/openapi-ts/test/3.1.x.spec.ts
index 0665abd4..ab11ad5f 100644
--- a/packages/openapi-ts/test/3.1.x.spec.ts
+++ b/packages/openapi-ts/test/3.1.x.spec.ts
@@ -48,6 +48,14 @@ describe(`OpenAPI ${VERSION}`, () => {
       }),
       description: 'allows arbitrary properties on objects',
     },
+    {
+      config: createConfig({
+        input: 'array-items-one-of-length-1.json',
+        output: 'array-items-one-of-length-1',
+      }),
+      description:
+        'generates correct array when items are oneOf array with single item',
+    },
     {
       config: createConfig({
         input: 'duplicate-null.json',
diff --git a/packages/openapi-ts/test/__snapshots__/3.0.x/array-items-one-of-length-1/index.ts b/packages/openapi-ts/test/__snapshots__/3.0.x/array-items-one-of-length-1/index.ts
new file mode 100644
index 00000000..56bade12
--- /dev/null
+++ b/packages/openapi-ts/test/__snapshots__/3.0.x/array-items-one-of-length-1/index.ts
@@ -0,0 +1,2 @@
+// This file is auto-generated by @hey-api/openapi-ts
+export * from './types.gen';
\ No newline at end of file
diff --git a/packages/openapi-ts/test/__snapshots__/3.0.x/array-items-one-of-length-1/types.gen.ts b/packages/openapi-ts/test/__snapshots__/3.0.x/array-items-one-of-length-1/types.gen.ts
new file mode 100644
index 00000000..d17a3c92
--- /dev/null
+++ b/packages/openapi-ts/test/__snapshots__/3.0.x/array-items-one-of-length-1/types.gen.ts
@@ -0,0 +1,7 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+export type Foo = {
+    foo?: Array<Bar>;
+};
+
+export type Bar = string;
\ No newline at end of file
diff --git a/packages/openapi-ts/test/__snapshots__/3.1.x/array-items-one-of-length-1/index.ts b/packages/openapi-ts/test/__snapshots__/3.1.x/array-items-one-of-length-1/index.ts
new file mode 100644
index 00000000..56bade12
--- /dev/null
+++ b/packages/openapi-ts/test/__snapshots__/3.1.x/array-items-one-of-length-1/index.ts
@@ -0,0 +1,2 @@
+// This file is auto-generated by @hey-api/openapi-ts
+export * from './types.gen';
\ No newline at end of file
diff --git a/packages/openapi-ts/test/__snapshots__/3.1.x/array-items-one-of-length-1/types.gen.ts b/packages/openapi-ts/test/__snapshots__/3.1.x/array-items-one-of-length-1/types.gen.ts
new file mode 100644
index 00000000..d17a3c92
--- /dev/null
+++ b/packages/openapi-ts/test/__snapshots__/3.1.x/array-items-one-of-length-1/types.gen.ts
@@ -0,0 +1,7 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+export type Foo = {
+    foo?: Array<Bar>;
+};
+
+export type Bar = string;
\ No newline at end of file
diff --git a/packages/openapi-ts/test/sample.cjs b/packages/openapi-ts/test/sample.cjs
index 0db06fb5..2b69ea7e 100644
--- a/packages/openapi-ts/test/sample.cjs
+++ b/packages/openapi-ts/test/sample.cjs
@@ -13,7 +13,7 @@ const main = async () => {
     input: {
       // include:
       //   '^(#/components/schemas/import|#/paths/api/v{api-version}/simple/options)$',
-      path: './test/spec/3.0.x/parameter-explode-false.json',
+      path: './test/spec/3.1.x/array-items-one-of-length-1.json',
       // path: 'https://mongodb-mms-prod-build-server.s3.amazonaws.com/openapi/2caffd88277a4e27c95dcefc7e3b6a63a3b03297-v2-2023-11-15.json',
     },
     // name: 'foo',
@@ -30,7 +30,7 @@ const main = async () => {
       {
         // asClass: true,
         // include...
-        name: '@hey-api/services',
+        // name: '@hey-api/services',
         // serviceNameBuilder: '^Parameters',
       },
       {
diff --git a/packages/openapi-ts/test/spec/3.0.x/array-items-one-of-length-1.json b/packages/openapi-ts/test/spec/3.0.x/array-items-one-of-length-1.json
new file mode 100644
index 00000000..d0613678
--- /dev/null
+++ b/packages/openapi-ts/test/spec/3.0.x/array-items-one-of-length-1.json
@@ -0,0 +1,31 @@
+{
+  "openapi": "3.0.2",
+  "info": {
+    "title": "OpenAPI 3.0.2 array items oneOf length 1 example",
+    "version": "1"
+  },
+  "components": {
+    "schemas": {
+      "Foo": {
+        "type": "object",
+        "properties": {
+          "foo": {
+            "type": "array",
+            "items": {
+              "oneOf": [
+                {
+                  "$ref": "#/components/schemas/Bar"
+                }
+              ]
+            },
+            "maxItems": 2147483647,
+            "minItems": 1
+          }
+        }
+      },
+      "Bar": {
+        "type": "string"
+      }
+    }
+  }
+}
diff --git a/packages/openapi-ts/test/spec/3.1.x/array-items-one-of-length-1.json b/packages/openapi-ts/test/spec/3.1.x/array-items-one-of-length-1.json
new file mode 100644
index 00000000..78a852bc
--- /dev/null
+++ b/packages/openapi-ts/test/spec/3.1.x/array-items-one-of-length-1.json
@@ -0,0 +1,31 @@
+{
+  "openapi": "3.1.0",
+  "info": {
+    "title": "OpenAPI 3.1.0 array items oneOf length 1 example",
+    "version": "1"
+  },
+  "components": {
+    "schemas": {
+      "Foo": {
+        "type": "object",
+        "properties": {
+          "foo": {
+            "type": "array",
+            "items": {
+              "oneOf": [
+                {
+                  "$ref": "#/components/schemas/Bar"
+                }
+              ]
+            },
+            "maxItems": 2147483647,
+            "minItems": 1
+          }
+        }
+      },
+      "Bar": {
+        "type": "string"
+      }
+    }
+  }
+}