diff --git a/src/generate-axios-client.test.ts b/src/generate-axios-client.test.ts
index 6d4f641..ff86a03 100644
--- a/src/generate-axios-client.test.ts
+++ b/src/generate-axios-client.test.ts
@@ -64,7 +64,7 @@ describe('generate', () => {
 
 const substituteParams = (url, params) =>
   Object.entries(params).reduce(
-    (url, [name, value]) => url.replace(":" + name, value),
+    (url, [name, value]) => url.replace(":" + name, encodeURIComponent(value)),
     url
   );
 
diff --git a/src/generate-axios-client.ts b/src/generate-axios-client.ts
index 7929c5a..591e874 100644
--- a/src/generate-axios-client.ts
+++ b/src/generate-axios-client.ts
@@ -49,7 +49,7 @@ export declare class ${outputClass} {
 
 const substituteParams = (url, params) =>
   Object.entries(params).reduce(
-    (url, [name, value]) => url.replace(":" + name, value),
+    (url, [name, value]) => url.replace(":" + name, encodeURIComponent(value)),
     url
   );
 
diff --git a/src/integration.axios.test.ts b/src/integration.axios.test.ts
index f18a4ad..2d822d9 100644
--- a/src/integration.axios.test.ts
+++ b/src/integration.axios.test.ts
@@ -14,69 +14,72 @@ const generateAndFormat = (input: GenerateAxiosClientInput) =>
     declaration: format(source.declaration, { parser: 'typescript' }),
   }));
 
-describe('integration tests', () => {
-  test('compile + execute', async () => {
-    const spec: OneSchemaDefinition = {
-      Resources: {},
-      Endpoints: {
-        'GET /posts': {
-          Name: 'getPosts',
-          Request: {
-            type: 'object',
-            additionalProperties: false,
-            properties: {
-              input: { type: 'string' },
-            },
+const prepare = async () => {
+  const spec: OneSchemaDefinition = {
+    Resources: {},
+    Endpoints: {
+      'GET /posts': {
+        Name: 'getPosts',
+        Request: {
+          type: 'object',
+          additionalProperties: false,
+          properties: {
+            input: { type: 'string' },
           },
-          Response: {
-            type: 'object',
-            additionalProperties: false,
-            properties: {
-              output: { type: 'string' },
-            },
+        },
+        Response: {
+          type: 'object',
+          additionalProperties: false,
+          properties: {
+            output: { type: 'string' },
           },
         },
-        'PUT /posts/:id': {
-          Name: 'putPost',
-          Request: {
-            type: 'object',
-            additionalProperties: false,
-            properties: {
-              message: { type: 'string' },
-            },
+      },
+      'PUT /posts/:id': {
+        Name: 'putPost',
+        Request: {
+          type: 'object',
+          additionalProperties: false,
+          properties: {
+            message: { type: 'string' },
           },
-          Response: {
-            type: 'object',
-            additionalProperties: false,
-            properties: {
-              id: { type: 'string' },
-              message: { type: 'string' },
-            },
+        },
+        Response: {
+          type: 'object',
+          additionalProperties: false,
+          properties: {
+            id: { type: 'string' },
+            message: { type: 'string' },
           },
         },
       },
-    };
+    },
+  };
 
-    const output = await generateAndFormat({ spec, outputClass: 'Service' });
+  const output = await generateAndFormat({ spec, outputClass: 'Service' });
 
-    writeFileSync(testGeneratedFile('.js'), output.javascript);
-    writeFileSync(testGeneratedFile('.d.ts'), output.declaration);
+  writeFileSync(testGeneratedFile('.js'), output.javascript);
+  writeFileSync(testGeneratedFile('.d.ts'), output.declaration);
 
-    const { Service } = await import(testGeneratedFile('.js'));
+  const { Service } = await import(testGeneratedFile('.js'));
 
-    const mockRequest = jest.fn();
-    const instance = new Service({
-      request: mockRequest,
-    } as any);
+  const request = jest.fn();
+  const client = new Service({ request });
+  return { client, request };
+};
 
-    expect(instance).toMatchObject({
+describe('integration tests', () => {
+  test('compile + execute', async () => {
+    const { client, request } = await prepare();
+
+    expect(client).toMatchObject({
       getPosts: expect.any(Function),
       putPost: expect.any(Function),
     });
 
-    await instance.getPosts({ input: 'some-input' });
-    expect(mockRequest).toHaveBeenCalledTimes(1);
-    expect(mockRequest).toHaveBeenNthCalledWith(1, {
+    await client.getPosts({ input: 'some-input' });
+    expect(request).toHaveBeenCalledTimes(1);
+    expect(request).toHaveBeenNthCalledWith(1, {
       method: 'GET',
       url: '/posts',
       params: {
@@ -84,9 +87,9 @@ describe('integration tests', () => {
       },
     });
 
-    await instance.putPost({ id: 'some-id', message: 'some-message' });
-    expect(mockRequest).toHaveBeenCalledTimes(2);
-    expect(mockRequest).toHaveBeenNthCalledWith(2, {
+    await client.putPost({ id: 'some-id', message: 'some-message' });
+    expect(request).toHaveBeenCalledTimes(2);
+    expect(request).toHaveBeenNthCalledWith(2, {
       method: 'PUT',
       url: '/posts/some-id',
       data: {
@@ -94,4 +97,19 @@ describe('integration tests', () => {
       },
     });
   });
+
+  test('generated code URI-encodes path parameters', async () => {
+    const { client, request } = await prepare();
+
+    await client.putPost({ id: 'some,bogus,param', message: 'some-message' });
+
+    expect(request).toHaveBeenCalledTimes(1);
+    expect(request).toHaveBeenCalledWith({
+      method: 'PUT',
+      url: '/posts/some%2Cbogus%2Cparam',
+      data: {
+        message: 'some-message',
+      },
+    });
+  });
 });