diff --git a/src/services/models/Schema.ts b/src/services/models/Schema.ts
index 309133a753..1b9abfd09b 100644
--- a/src/services/models/Schema.ts
+++ b/src/services/models/Schema.ts
@@ -104,7 +104,7 @@ export class SchemaModel {
     this.constraints = humanizeConstraints(schema);
     this.displayType = this.type;
     this.displayFormat = this.format;
-    this.isPrimitive = isPrimitiveType(schema);
+    this.isPrimitive = isPrimitiveType(schema, this.type);
     this.default = schema.default;
     this.readOnly = !!schema.readOnly;
     this.writeOnly = !!schema.writeOnly;
diff --git a/src/utils/__tests__/openapi.test.ts b/src/utils/__tests__/openapi.test.ts
index 9e61c9080d..34e847d213 100644
--- a/src/utils/__tests__/openapi.test.ts
+++ b/src/utils/__tests__/openapi.test.ts
@@ -187,6 +187,17 @@ describe('Utils', () => {
       };
       expect(isPrimitiveType(schema)).toEqual(false);
     });
+
+    it('should work with externally provided type', () => {
+      const schema = {
+        properties: {
+          a: {
+            type: 'string',
+          },
+        },
+      };
+      expect(isPrimitiveType(schema, 'object')).toEqual(false);
+    });
   });
 
   describe('openapi mergeParams', () => {
diff --git a/src/utils/openapi.ts b/src/utils/openapi.ts
index 2aecb6459d..080d010f10 100644
--- a/src/utils/openapi.ts
+++ b/src/utils/openapi.ts
@@ -105,18 +105,18 @@ export function detectType(schema: OpenAPISchema): string {
   return 'any';
 }
 
-export function isPrimitiveType(schema: OpenAPISchema) {
+export function isPrimitiveType(schema: OpenAPISchema, type: string | undefined = schema.type) {
   if (schema.oneOf !== undefined || schema.anyOf !== undefined) {
     return false;
   }
 
-  if (schema.type === 'object') {
+  if (type === 'object') {
     return schema.properties !== undefined
       ? Object.keys(schema.properties).length === 0
       : schema.additionalProperties === undefined;
   }
 
-  if (schema.type === 'array') {
+  if (type === 'array') {
     if (schema.items === undefined) {
       return true;
     }