diff --git a/projects/mercurial/project.yaml b/projects/mercurial/project.yaml
index f69792145..7944417c2 100644
--- a/projects/mercurial/project.yaml
+++ b/projects/mercurial/project.yaml
@@ -11,4 +11,5 @@ sanitizers:
   - undefined
 # Disabled MSAN because of https://github.com/google/oss-fuzz/issues/6294
 #  - memory
-coverage_extra_args: -ignore-filename-regex=.*/sanpy/.*
\ No newline at end of file
+coverage_extra_args: -ignore-filename-regex=.*/sanpy/.*
+main_repo: "https://www.mercurial-scm.org/repo/hg"