diff --git a/src/types.ts b/src/types.ts
index 5e16f9a..0f2f6c2 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -62,7 +62,7 @@ export interface FullConfig {
 }
 
 export class MigrationError extends Error {
-  public cause?: string
+  public cause?: Error
 }
 
 export type FileType = "sql" | "js"