diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f899df9a6f7..965759498c9d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 - `[jest-runtime]` If `require` fails without a file extension, print all files that match with one ([#7160](https://github.com/facebook/jest/pull/7160))
 - `[jest-haste-map]` Make `ignorePattern` optional ([#7166](https://github.com/facebook/jest/pull/7166))
 - `[jest-runtime]` Remove `cacheDirectory` from `ignorePattern` for `HasteMap` if not necessary ([#7166](https://github.com/facebook/jest/pull/7166))
+- `[jest-changed-files]` Return correctly the changed files when using `lastCommit=true` on Mercurial repositories ([#XXX](https://github.com/facebook/jest/pull/XXX))
 
 ### Fixes
 
diff --git a/packages/jest-changed-files/src/hg.js b/packages/jest-changed-files/src/hg.js
index f8429a605d90..7dacb454da10 100644
--- a/packages/jest-changed-files/src/hg.js
+++ b/packages/jest-changed-files/src/hg.js
@@ -41,7 +41,7 @@ const adapter: SCMAdapter = {
     } else if (options && options.changedSince) {
       args.push('--rev', `ancestor(., ${options.changedSince})`);
     } else if (options && options.lastCommit === true) {
-      args.push('-A');
+      args.push('--change', '.');
     }
     args.push(...includePaths);