diff --git a/src/openApi/v2/parser/getModel.ts b/src/openApi/v2/parser/getModel.ts
index 5c3c5ac8..48798383 100644
--- a/src/openApi/v2/parser/getModel.ts
+++ b/src/openApi/v2/parser/getModel.ts
@@ -22,7 +22,7 @@ export function getModel(openApi: OpenApi, definition: OpenApiSchema, isDefiniti
         isDefinition,
         isReadOnly: definition.readOnly === true,
         isNullable: definition['x-nullable'] === true,
-        isRequired: false,
+        isRequired: definition.default !== undefined,
         format: definition.format,
         maximum: definition.maximum,
         exclusiveMaximum: definition.exclusiveMaximum,
diff --git a/src/openApi/v2/parser/getModelProperties.ts b/src/openApi/v2/parser/getModelProperties.ts
index 2e577c91..8d17386d 100644
--- a/src/openApi/v2/parser/getModelProperties.ts
+++ b/src/openApi/v2/parser/getModelProperties.ts
@@ -15,7 +15,7 @@ export function getModelProperties(openApi: OpenApi, definition: OpenApiSchema,
     for (const propertyName in definition.properties) {
         if (definition.properties.hasOwnProperty(propertyName)) {
             const property = definition.properties[propertyName];
-            const propertyRequired = definition.required?.includes(propertyName);
+            const propertyRequired = definition.required?.includes(propertyName) || property.default !== undefined;
             if (property.$ref) {
                 const model = getType(property.$ref);
                 models.push({
@@ -28,7 +28,7 @@ export function getModelProperties(openApi: OpenApi, definition: OpenApiSchema,
                     description: getComment(property.description),
                     isDefinition: false,
                     isReadOnly: property.readOnly === true,
-                    isRequired: propertyRequired === true,
+                    isRequired: propertyRequired,
                     isNullable: property['x-nullable'] === true,
                     format: property.format,
                     maximum: property.maximum,
@@ -61,7 +61,7 @@ export function getModelProperties(openApi: OpenApi, definition: OpenApiSchema,
                     description: getComment(property.description),
                     isDefinition: false,
                     isReadOnly: property.readOnly === true,
-                    isRequired: propertyRequired === true,
+                    isRequired: propertyRequired,
                     isNullable: property['x-nullable'] === true,
                     format: property.format,
                     maximum: property.maximum,
diff --git a/src/openApi/v3/parser/getModel.ts b/src/openApi/v3/parser/getModel.ts
index c5d415bb..ecd46cd2 100644
--- a/src/openApi/v3/parser/getModel.ts
+++ b/src/openApi/v3/parser/getModel.ts
@@ -23,7 +23,7 @@ export function getModel(openApi: OpenApi, definition: OpenApiSchema, isDefiniti
         isDefinition,
         isReadOnly: definition.readOnly === true,
         isNullable: definition.nullable === true,
-        isRequired: false,
+        isRequired: definition.default !== undefined,
         format: definition.format,
         maximum: definition.maximum,
         exclusiveMaximum: definition.exclusiveMaximum,
diff --git a/src/openApi/v3/parser/getModelProperties.ts b/src/openApi/v3/parser/getModelProperties.ts
index 17caa16a..ff22fe5a 100644
--- a/src/openApi/v3/parser/getModelProperties.ts
+++ b/src/openApi/v3/parser/getModelProperties.ts
@@ -15,7 +15,7 @@ export function getModelProperties(openApi: OpenApi, definition: OpenApiSchema,
     for (const propertyName in definition.properties) {
         if (definition.properties.hasOwnProperty(propertyName)) {
             const property = definition.properties[propertyName];
-            const propertyRequired = definition.required?.includes(propertyName);
+            const propertyRequired = definition.required?.includes(propertyName) || property.default !== undefined;
             if (property.$ref) {
                 const model = getType(property.$ref);
                 models.push({
@@ -28,7 +28,7 @@ export function getModelProperties(openApi: OpenApi, definition: OpenApiSchema,
                     description: getComment(property.description),
                     isDefinition: false,
                     isReadOnly: property.readOnly === true,
-                    isRequired: propertyRequired === true,
+                    isRequired: propertyRequired,
                     isNullable: property.nullable === true,
                     format: property.format,
                     maximum: property.maximum,
@@ -61,7 +61,7 @@ export function getModelProperties(openApi: OpenApi, definition: OpenApiSchema,
                     description: getComment(property.description),
                     isDefinition: false,
                     isReadOnly: property.readOnly === true,
-                    isRequired: propertyRequired === true,
+                    isRequired: propertyRequired,
                     isNullable: property.nullable === true,
                     format: property.format,
                     maximum: property.maximum,
diff --git a/test/__snapshots__/index.spec.js.snap b/test/__snapshots__/index.spec.js.snap
index 1b284fd7..ca5248f8 100644
--- a/test/__snapshots__/index.spec.js.snap
+++ b/test/__snapshots__/index.spec.js.snap
@@ -4397,7 +4397,7 @@ export class ComplexService {
         requestBody?: {
             readonly key: string | null,
             name: string | null,
-            enabled?: boolean,
+            enabled: boolean,
             readonly type: 'Monkey' | 'Horse' | 'Bird',
             listOfModels?: Array<ModelWithString> | null,
             listOfStrings?: Array<string> | null,