diff --git a/src/index.ts b/src/index.ts
index 31c1bf9c2..fadabba73 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -42,11 +42,12 @@ export type Options = {
  * @param clientName Custom client class name
  * @param useOptions Use options or arguments functions
  * @param useUnionTypes Use union types instead of enums
+ * @param autoformat Process generated files with autoformatter
  * @param exportCore Generate core client classes
  * @param exportServices Generate services
  * @param exportModels Generate models
  * @param exportSchemas Generate schemas
- * @param ignoreOperationId Ignore operationId
+ * @param useOperationId should the operationId be used when generating operation names
  * @param indent Indentation options (4, 2 or tab)
  * @param postfixServices Service name postfix
  * @param postfixModels Model name postfix
diff --git a/src/openApi/v3/parser/getModelComposition.ts b/src/openApi/v3/parser/getModelComposition.ts
index c6d4fca72..fcace09c0 100644
--- a/src/openApi/v3/parser/getModelComposition.ts
+++ b/src/openApi/v3/parser/getModelComposition.ts
@@ -92,23 +92,30 @@ export const getModelComposition = ({
     }
 
     if (properties.length) {
-        composition.properties.push({
-            name: 'properties',
-            export: 'interface',
-            type: 'any',
-            base: 'any',
-            template: null,
-            link: null,
-            description: '',
-            isDefinition: false,
-            isReadOnly: false,
-            isNullable: false,
-            isRequired: false,
-            imports: [],
-            enum: [],
-            enums: [],
-            properties,
-        });
+        const foundComposition = findModelComposition(definition);
+        if (foundComposition?.type === 'one-of') {
+            composition.properties.forEach(property => {
+                property.properties.push(...properties);
+            });
+        } else {
+            composition.properties.push({
+                name: 'properties',
+                export: 'interface',
+                type: 'any',
+                base: 'any',
+                template: null,
+                link: null,
+                description: '',
+                isDefinition: false,
+                isReadOnly: false,
+                isNullable: false,
+                isRequired: false,
+                imports: [],
+                enum: [],
+                enums: [],
+                properties,
+            });
+        }
     }
 
     return composition;
diff --git a/test/__snapshots__/index.spec.ts.snap b/test/__snapshots__/index.spec.ts.snap
index faff498eb..ef8d9fc54 100644
--- a/test/__snapshots__/index.spec.ts.snap
+++ b/test/__snapshots__/index.spec.ts.snap
@@ -3775,6 +3775,7 @@ export type { CompositionWithNestedAnyOfAndNull } from './models/CompositionWith
 export type { CompositionWithOneOf } from './models/CompositionWithOneOf';
 export type { CompositionWithOneOfAndComplexArrayDictionary } from './models/CompositionWithOneOfAndComplexArrayDictionary';
 export type { CompositionWithOneOfAndNullable } from './models/CompositionWithOneOfAndNullable';
+export type { CompositionWithOneOfAndProperties } from './models/CompositionWithOneOfAndProperties';
 export type { CompositionWithOneOfAndSimpleArrayDictionary } from './models/CompositionWithOneOfAndSimpleArrayDictionary';
 export type { CompositionWithOneOfAndSimpleDictionary } from './models/CompositionWithOneOfAndSimpleDictionary';
 export type { CompositionWithOneOfAnonymous } from './models/CompositionWithOneOfAnonymous';
@@ -3856,6 +3857,7 @@ export { $CompositionWithNestedAnyOfAndNull } from './schemas/$CompositionWithNe
 export { $CompositionWithOneOf } from './schemas/$CompositionWithOneOf';
 export { $CompositionWithOneOfAndComplexArrayDictionary } from './schemas/$CompositionWithOneOfAndComplexArrayDictionary';
 export { $CompositionWithOneOfAndNullable } from './schemas/$CompositionWithOneOfAndNullable';
+export { $CompositionWithOneOfAndProperties } from './schemas/$CompositionWithOneOfAndProperties';
 export { $CompositionWithOneOfAndSimpleArrayDictionary } from './schemas/$CompositionWithOneOfAndSimpleArrayDictionary';
 export { $CompositionWithOneOfAndSimpleDictionary } from './schemas/$CompositionWithOneOfAndSimpleDictionary';
 export { $CompositionWithOneOfAnonymous } from './schemas/$CompositionWithOneOfAnonymous';
@@ -4344,6 +4346,26 @@ export type CompositionWithOneOfAndNullable = {
 "
 `;
 
+exports[`v3 should generate: test/generated/v3/models/CompositionWithOneOfAndProperties.ts 1`] = `
+"/* generated using openapi-typescript-codegen -- do no edit */
+/* istanbul ignore file */
+/* tslint:disable */
+/* eslint-disable */
+import type { NonAsciiStringæøåÆØÅöôêÊ字符串 } from './NonAsciiStringæøåÆØÅöôêÊ字符串';
+import type { SimpleParameter } from './SimpleParameter';
+export type CompositionWithOneOfAndProperties = ({
+    foo: SimpleParameter;
+    baz: number | null;
+    qux: number;
+} | {
+    bar: NonAsciiStringæøåÆØÅöôêÊ字符串;
+    baz: number | null;
+    qux: number;
+});
+
+"
+`;
+
 exports[`v3 should generate: test/generated/v3/models/CompositionWithOneOfAndSimpleArrayDictionary.ts 1`] = `
 "/* generated using openapi-typescript-codegen -- do no edit */
 /* istanbul ignore file */
@@ -5802,6 +5824,54 @@ export const $CompositionWithOneOfAndNullable = {
 "
 `;
 
+exports[`v3 should generate: test/generated/v3/schemas/$CompositionWithOneOfAndProperties.ts 1`] = `
+"/* generated using openapi-typescript-codegen -- do no edit */
+/* istanbul ignore file */
+/* tslint:disable */
+/* eslint-disable */
+export const $CompositionWithOneOfAndProperties = {
+    type: 'one-of',
+    contains: [{
+        properties: {
+            foo: {
+                type: 'SimpleParameter',
+                isRequired: true,
+            },
+            baz: {
+                type: 'number',
+                isRequired: true,
+                isNullable: true,
+                format: 'uint16',
+            },
+            qux: {
+                type: 'number',
+                isRequired: true,
+                format: 'uint8',
+            },
+        },
+    }, {
+        properties: {
+            bar: {
+                type: 'NonAsciiStringæøåÆØÅöôêÊ字符串',
+                isRequired: true,
+            },
+            baz: {
+                type: 'number',
+                isRequired: true,
+                isNullable: true,
+                format: 'uint16',
+            },
+            qux: {
+                type: 'number',
+                isRequired: true,
+                format: 'uint8',
+            },
+        },
+    }],
+} as const;
+"
+`;
+
 exports[`v3 should generate: test/generated/v3/schemas/$CompositionWithOneOfAndSimpleArrayDictionary.ts 1`] = `
 "/* generated using openapi-typescript-codegen -- do no edit */
 /* istanbul ignore file */
diff --git a/test/spec/v3.json b/test/spec/v3.json
index 5149647c3..bd728203e 100644
--- a/test/spec/v3.json
+++ b/test/spec/v3.json
@@ -2813,6 +2813,52 @@
                     }
                 },
                 "type": "object"
+            },
+            "CompositionWithOneOfAndProperties": {
+                "type": "object",
+                "oneOf": [
+                    {
+                        "type": "object",
+                        "required": [
+                            "foo"
+                        ],
+                        "properties": {
+                            "foo": {
+                                "$ref": "#/components/parameters/SimpleParameter"
+                            }
+                        },
+                        "additionalProperties": false
+                    },
+                    {
+                        "type": "object",
+                        "required": [
+                            "bar"
+                        ],
+                        "properties": {
+                            "bar": {
+                                "$ref": "#/components/schemas/NonAsciiStringæøåÆØÅöôêÊ字符串"
+                            }
+                        },
+                        "additionalProperties": false
+                    }
+                ],
+                "required": [
+                    "baz",
+                    "qux"
+                ],
+                "properties": {
+                    "baz": {
+                        "type": "integer",
+                        "format": "uint16",
+                        "minimum": 0.0,
+                        "nullable": true
+                    },
+                    "qux": {
+                        "type": "integer",
+                        "format": "uint8",
+                        "minimum": 0.0
+                    }
+                }
             }
         }
     }