diff --git a/packages/typegen/src/write/index.ts b/packages/typegen/src/write/index.ts
index badbfead..9bc5dac8 100644
--- a/packages/typegen/src/write/index.ts
+++ b/packages/typegen/src/write/index.ts
@@ -6,12 +6,14 @@ import {addTags} from '../query/tag'
 import * as assert from 'assert'
 import * as fs from 'fs'
 import * as path from 'path'
+import {prettifyOne} from './prettify'
 
 export type WriteFile = (filepath: string, content: string) => Promise<void>
 
 export const defaultWriteFile: WriteFile = async (filepath, content) => {
   await fs.promises.mkdir(path.dirname(filepath), {recursive: true})
-  await fs.promises.writeFile(filepath, content)
+  const pretty = prettifyOne({filepath, content})
+  await fs.promises.writeFile(filepath, pretty)
 }
 
 /**
diff --git a/packages/typegen/src/write/inline.ts b/packages/typegen/src/write/inline.ts
index 3d60f3e4..2a5aedd7 100644
--- a/packages/typegen/src/write/inline.ts
+++ b/packages/typegen/src/write/inline.ts
@@ -1,7 +1,7 @@
 import * as lodash from 'lodash'
 import {TaggedQuery} from '../types'
 import {relativeUnixPath} from '../util'
-import {prettifyOne, tsPrettify} from './prettify'
+import {tsPrettify} from './prettify'
 import type * as ts from 'typescript'
 import * as path from 'path'
 import {queryInterfaces} from './typescript'
@@ -45,7 +45,7 @@ export function getFileWriter({getQueriesModulePath = defaultGetQueriesModule, w
       })
     } else {
       let content = queryInterfaces(group)
-      await writeFile(destPath, prettifyOne({filepath: destPath, content}))
+      await writeFile(destPath, content)
 
       const importPath = relativeUnixPath(destPath, path.dirname(file))
       const importStatement = `import * as queries from './${importPath.replace(/\.(js|ts|tsx)$/, '')}'`
@@ -67,7 +67,7 @@ export function getFileWriter({getQueriesModulePath = defaultGetQueriesModule, w
 
     const newSource = applyEdits(originalSource, edits)
 
-    await writeFile(file, prettifyOne({filepath: file, content: newSource}))
+    await writeFile(file, newSource)
 
     function visit(node: ts.Node) {
       if (ts.isModuleDeclaration(node) && node.name.getText() === 'queries') {
diff --git a/packages/typegen/src/write/sql.ts b/packages/typegen/src/write/sql.ts
index b1a4f4f7..3e6021c7 100644
--- a/packages/typegen/src/write/sql.ts
+++ b/packages/typegen/src/write/sql.ts
@@ -2,7 +2,7 @@ import {dedent, relativeUnixPath, typeName, truncateQuery} from '../util'
 import * as path from 'path'
 import {getterExpression, jsdocComment, queryInterfaces, quotePropKey} from './typescript'
 import {TaggedQuery} from '../types'
-import {prettifyOne, tsPrettify} from './prettify'
+import {tsPrettify} from './prettify'
 import {WriteFile} from '.'
 
 export interface WriteSQLFileOptions {
@@ -19,7 +19,7 @@ export const getSQLHelperWriter =
     const destPath = getModulePath(query.file)
     const newContent = getSQLHelperContent(query, destPath)
 
-    await writeFile(destPath, prettifyOne({content: newContent, filepath: destPath}))
+    await writeFile(destPath, newContent)
   }
 
 export function getSQLHelperContent(query: TaggedQuery, destPath: string) {
diff --git a/packages/typegen/test/ugly.test.ts b/packages/typegen/test/ugly.test.ts
index d6666f47..268edd73 100644
--- a/packages/typegen/test/ugly.test.ts
+++ b/packages/typegen/test/ugly.test.ts
@@ -1,6 +1,9 @@
 import * as fsSyncer from 'fs-syncer'
 import * as typegen from '../src'
+import {defaultWriteTypes} from '../src/write'
 import {getHelper} from './helper'
+import * as fs from 'fs'
+import * as path from 'path'
 
 export const {typegenOptions, logger, poolHelper: helper} = getHelper({__filename})
 
@@ -119,3 +122,62 @@ test('prettier can fail', async () => {
       "
   `)
 })
+
+test('no prettier warning for custom writeTypes', async () => {
+  const syncer = fsSyncer.jestFixture({
+    targetState: {
+      'index.ts': `
+        import {sql} from 'slonik';
+
+        export default sql\`select id, n from test_table\`;
+      `,
+    },
+  })
+
+  syncer.sync()
+
+  mockFormat.mockImplementationOnce(() => {
+    throw Object.assign(new Error('prettier not found'), {code: 'MODULE_NOT_FOUND'})
+  })
+  const mockWarn = jest.spyOn(console, 'warn').mockReset()
+
+  const options = typegenOptions(syncer.baseDir)
+  await typegen.generate({
+    ...options,
+    writeTypes: queries => {
+      return defaultWriteTypes({
+        writeFile: async (filepath, content) => {
+          await fs.promises.mkdir(path.dirname(filepath), {recursive: true})
+          // dummy lint
+          const linted = content.replace(/;/g, '')
+          await fs.promises.writeFile(filepath, linted)
+        },
+      })(queries)
+    },
+  })
+
+  expect(mockWarn).not.toHaveBeenCalled()
+
+  expect(syncer.yaml()).toMatchInlineSnapshot(`
+    "---
+    index.ts: |-
+      import {sql} from 'slonik'
+      
+      export default sql<queries.TestTable>\`select id, n from test_table\`
+      
+      export declare namespace queries {
+          // Generated by @slonik/typegen
+      
+          /** - query: \`select id, n from test_table\` */
+          export interface TestTable {
+      
+              /** column: \`ugly_test.test_table.id\`, not null: \`true\`, regtype: \`integer\` */
+              id: number
+      
+              /** column: \`ugly_test.test_table.n\`, regtype: \`integer\` */
+              n: (number) | null
+          }
+      }
+      "
+    `)
+})