diff --git a/packages/backend-common/src/database/DatabaseManager.test.ts b/packages/backend-common/src/database/DatabaseManager.test.ts
index d5271bc2b5..2587a70423 100644
--- a/packages/backend-common/src/database/DatabaseManager.test.ts
+++ b/packages/backend-common/src/database/DatabaseManager.test.ts
@@ -284,7 +284,7 @@ describe('DatabaseManager', () => {
       // sqlite3 uses 'filename' instead of 'database'
       expect(overrides).toHaveProperty(
         'connection.filename',
-        `plugin_with_different_client/${pluginId}`,
+        `plugin_with_different_client/${pluginId}.sqlite`,
       );
     });
 
diff --git a/packages/backend-common/src/database/DatabaseManager.ts b/packages/backend-common/src/database/DatabaseManager.ts
index 977516a18b..aee47aedc1 100644
--- a/packages/backend-common/src/database/DatabaseManager.ts
+++ b/packages/backend-common/src/database/DatabaseManager.ts
@@ -119,7 +119,7 @@ export class DatabaseManager {
 
       // if persisting to a file, create separate files per plugin to avoid db migration issues.
       if (sqliteFilename !== ':memory:') {
-        return `${sqliteFilename}/${pluginId}`;
+        return `${sqliteFilename}/${pluginId}.sqlite`;
       }
 
       // sqlite database name should fallback to ':memory:' as a special case