diff --git a/extensions/vscode-api-tests/src/singlefolder-tests/terminal.test.ts b/extensions/vscode-api-tests/src/singlefolder-tests/terminal.test.ts
index 8e2afa3ba1376fe8d07bea7197339594f5bb3fd8..01232a99c8c976714a74618cdc6dbea128e6e2ea 100644
--- a/extensions/vscode-api-tests/src/singlefolder-tests/terminal.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/terminal.test.ts
@@ -349,7 +349,7 @@ import { doesNotThrow, equal, ok, deepEqual, throws } from 'assert';
 							term1Write.fire('write1');
 
 							// Wait until the data is written
-							await new Promise(resolve => { resolveOnceDataWritten = resolve; });
+							await new Promise<void>(resolve => { resolveOnceDataWritten = resolve; });
 
 							term1Close.fire();