diff --git a/packages/cli/src/swagger/specGenerator2.ts b/packages/cli/src/swagger/specGenerator2.ts
index ae2c39b21..c9218fdc7 100644
--- a/packages/cli/src/swagger/specGenerator2.ts
+++ b/packages/cli/src/swagger/specGenerator2.ts
@@ -2,6 +2,7 @@ import { ExtendedSpecConfig } from '../cli';
 import { Tsoa, assertNever, Swagger } from '@tsoa/runtime';
 import { isVoidType } from '../utils/isVoidType';
 import { convertColonPathParams, normalisePath } from './../utils/pathUtils';
+import { getValue } from './../utils/swaggerUtils';
 import { SpecGenerator } from './specGenerator';
 import { UnspecifiedObject } from '../utils/unspecifiedObject';
 
@@ -462,6 +463,6 @@ export class SpecGenerator2 extends SpecGenerator {
     const types = this.determineTypesUsedInEnum(enumType.enums);
     const type = types.size === 1 ? types.values().next().value : 'string';
     const nullable = enumType.enums.includes(null) ? true : false;
-    return { type, enum: enumType.enums.map(member => (member === null ? null : String(member))), ['x-nullable']: nullable };
+    return { type, enum: enumType.enums.map(member => getValue(type, member)), ['x-nullable']: nullable };
   }
 }
diff --git a/packages/cli/src/swagger/specGenerator3.ts b/packages/cli/src/swagger/specGenerator3.ts
index 581b77719..d8073a45d 100644
--- a/packages/cli/src/swagger/specGenerator3.ts
+++ b/packages/cli/src/swagger/specGenerator3.ts
@@ -2,6 +2,7 @@ import { ExtendedSpecConfig } from '../cli';
 import { Tsoa, assertNever, Swagger } from '@tsoa/runtime';
 import { isVoidType } from '../utils/isVoidType';
 import { convertColonPathParams, normalisePath } from './../utils/pathUtils';
+import { getValue } from './../utils/swaggerUtils';
 import { SpecGenerator } from './specGenerator';
 import { UnspecifiedObject } from '../utils/unspecifiedObject';
 
@@ -639,7 +640,7 @@ export class SpecGenerator3 extends SpecGenerator {
     if (types.size === 1) {
       const type = types.values().next().value;
       const nullable = enumType.enums.includes(null) ? true : false;
-      return { type, enum: enumType.enums.map(member => (member === null ? null : String(member))), nullable };
+      return { type, enum: enumType.enums.map(member => getValue(type, member)), nullable };
     } else {
       const valuesDelimited = Array.from(types).join(',');
       throw new Error(`Enums can only have string or number values, but enum had ${valuesDelimited}`);
diff --git a/packages/cli/src/utils/swaggerUtils.ts b/packages/cli/src/utils/swaggerUtils.ts
new file mode 100644
index 000000000..c1ebb64f0
--- /dev/null
+++ b/packages/cli/src/utils/swaggerUtils.ts
@@ -0,0 +1,16 @@
+export function getValue(type: 'string' | 'number' | 'integer' | 'boolean', member: any) {
+  if (member === null) {
+    return null;
+  }
+
+  switch (type) {
+    case 'integer':
+    case 'number':
+      return Number(member);
+    case 'boolean':
+      return member;
+    case 'string':
+    default:
+      return String(member);
+  }
+}
diff --git a/tests/unit/swagger/definitionsGeneration/definitions.spec.ts b/tests/unit/swagger/definitionsGeneration/definitions.spec.ts
index ab3ec61d3..5210b8164 100644
--- a/tests/unit/swagger/definitionsGeneration/definitions.spec.ts
+++ b/tests/unit/swagger/definitionsGeneration/definitions.spec.ts
@@ -442,7 +442,7 @@ describe('Definition generation', () => {
               throw new Error(`There was no 'enum' property on ${propertyName}.`);
             }
             expect(propertySchema.enum).to.have.length(1, `for property ${propertyName}.enum`);
-            expect(propertySchema.enum).to.include('3.1415', `for property ${propertyName}.enum`);
+            expect(propertySchema.enum).to.include(3.1415, `for property ${propertyName}.enum`);
           },
           dateValue: (propertyName, propertySchema) => {
             expect(propertySchema.type).to.eq('string', `for property ${propertyName}.type`);
diff --git a/tests/unit/swagger/schemaDetails3.spec.ts b/tests/unit/swagger/schemaDetails3.spec.ts
index c8cbdd16e..ae57319cb 100644
--- a/tests/unit/swagger/schemaDetails3.spec.ts
+++ b/tests/unit/swagger/schemaDetails3.spec.ts
@@ -1114,8 +1114,8 @@ describe('Definition generation for OpenAPI 3.0.0', () => {
             expect(propertySchema).to.deep.eq({
               anyOf: [
                 { type: 'string', enum: ['String'] },
-                { type: 'number', enum: ['1', '20'] },
-                { type: 'boolean', enum: ['true', 'false'] },
+                { type: 'number', enum: [1, 20] },
+                { type: 'boolean', enum: [true, false] },
               ],
               default: undefined,
               description: undefined,
@@ -1127,8 +1127,8 @@ describe('Definition generation for OpenAPI 3.0.0', () => {
             expect(propertySchema).to.deep.eq({
               anyOf: [
                 { type: 'string', enum: ['String'] },
-                { type: 'number', enum: ['1', '20'] },
-                { type: 'boolean', enum: ['true', 'false'] },
+                { type: 'number', enum: [1, 20] },
+                { type: 'boolean', enum: [true, false] },
               ],
               default: undefined,
               description: undefined,
@@ -1144,7 +1144,7 @@ describe('Definition generation for OpenAPI 3.0.0', () => {
               throw new Error(`There was no 'enum' property on ${propertyName}.`);
             }
             expect(propertySchema.enum).to.have.length(1, `for property ${propertyName}.enum`);
-            expect(propertySchema.enum).to.include('3.1415', `for property ${propertyName}.enum`);
+            expect(propertySchema.enum).to.include(3.1415, `for property ${propertyName}.enum`);
           },
           dateValue: (propertyName, propertySchema) => {
             expect(propertySchema.type).to.eq('string', `for property ${propertyName}.type`);