diff --git a/lix/libfetchers/mercurial.cc b/lix/libfetchers/mercurial.cc
index 3454d58ba..eda49f93c 100644
--- a/lix/libfetchers/mercurial.cc
+++ b/lix/libfetchers/mercurial.cc
@@ -288,7 +288,7 @@ struct MercurialInputScheme : InputScheme
         }
 
         auto tokens = tokenizeString<std::vector<std::string>>(
-            runHg({ "log", "-R", cacheDir, "-r", revOrRef, "--template", "{node} {rev} {branch}" }));
+            runHg({ "log", "-R", cacheDir, "-r", revOrRef, "--template", "{node} {count(revset('::{rev}'))} {branch}" }));
         assert(tokens.size() == 3);
 
         input.attrs.insert_or_assign("rev", Hash::parseAny(tokens[0], HashType::SHA1).gitRev());
diff --git a/tests/functional/fetchMercurial.sh b/tests/functional/fetchMercurial.sh
index d82347829..624705e9b 100644
--- a/tests/functional/fetchMercurial.sh
+++ b/tests/functional/fetchMercurial.sh
@@ -54,7 +54,7 @@ path2=$(nix eval --impure --raw --expr "(builtins.fetchMercurial \"file://$repo\
 [[ $path = $path2 ]]
 
 [[ $(nix eval --impure --raw --expr "(builtins.fetchMercurial \"file://$repo\").branch") = default ]]
-[[ $(nix eval --impure --expr "(builtins.fetchMercurial \"file://$repo\").revCount") = 1 ]]
+[[ $(nix eval --impure --expr "(builtins.fetchMercurial \"file://$repo\").revCount") = 2 ]]
 [[ $(nix eval --impure --raw --expr "(builtins.fetchMercurial \"file://$repo\").rev") = $rev2 ]]
 
 # But with TTL 0, it should fail.
diff --git a/tests/functional/flakes/mercurial.sh b/tests/functional/flakes/mercurial.sh
index 7074af6f7..b5756a3ea 100644
--- a/tests/functional/flakes/mercurial.sh
+++ b/tests/functional/flakes/mercurial.sh
@@ -37,7 +37,7 @@ hg commit --config ui.username=foobar@example.org $flake2Dir -m 'Add lock file'
 
 nix flake metadata --json hg+file://$flake2Dir --refresh | jq -e -r .revision
 nix flake metadata --json hg+file://$flake2Dir
-[[ $(nix flake metadata --json hg+file://$flake2Dir | jq -e -r .revCount) = 1 ]]
+[[ $(nix flake metadata --json hg+file://$flake2Dir | jq -e -r .revCount) = 2 ]]
 
 nix build -o $TEST_ROOT/result hg+file://$flake2Dir --no-registries --no-allow-dirty
 nix build -o $TEST_ROOT/result hg+file://$flake2Dir --no-use-registries --no-allow-dirty