diff --git a/.changeset/wicked-mice-pretend.md b/.changeset/wicked-mice-pretend.md
new file mode 100644
index 000000000000..3d2a4b7f35bc
--- /dev/null
+++ b/.changeset/wicked-mice-pretend.md
@@ -0,0 +1,5 @@
+---
+"@typescript/ata": patch
+---
+
+Fix return type of `setupTypeAcquisition`
diff --git a/packages/ata/src/userFacingTypes.d.ts b/packages/ata/src/userFacingTypes.d.ts
index 8eec41430aa2..4580d7a27e9e 100644
--- a/packages/ata/src/userFacingTypes.d.ts
+++ b/packages/ata/src/userFacingTypes.d.ts
@@ -33,7 +33,7 @@ type ModuleMeta = { state: "loading" }
  * basically exported for tests and should be considered
  * implementation details by consumers.
  */
-export const setupTypeAcquisition: (config: ATABootstrapConfig) => (initialSourceFile: string) => void
+export const setupTypeAcquisition: (config: ATABootstrapConfig) => (initialSourceFile: string) => Promise<void>
 
 interface Logger {
   log: (...args: any[]) => void