diff --git a/src/libcinnabar.rs b/src/libcinnabar.rs
index 25dd2bc75..72900758e 100644
--- a/src/libcinnabar.rs
+++ b/src/libcinnabar.rs
@@ -16,7 +16,7 @@ use crate::libgit::{
     HG2GIT_OID,
 };
 use crate::oid::{Abbrev, ObjectId};
-use crate::store::{store_git_commit, FILES_META, METADATA_FLAGS};
+use crate::store::{store_git_commit, MetadataFlags, METADATA_FLAGS};
 
 #[allow(non_camel_case_types)]
 #[derive(Clone, Debug)]
@@ -174,7 +174,7 @@ unsafe fn ensure_notes(t: *mut cinnabar_notes_tree) {
             oid = HG2GIT_OID;
         } else if ptr::eq(t, &files_meta.0) {
             oid = FILES_META_OID;
-            if METADATA_FLAGS & FILES_META == 0 {
+            if METADATA_FLAGS.contains(MetadataFlags::FILES_META) {
                 flags = NOTES_INIT_EMPTY;
             }
         } else {
diff --git a/src/main.rs b/src/main.rs
index 05d9b0a54..c0b0ac637 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -260,7 +260,7 @@ fn do_done_and_check(args: &[&[u8]]) -> bool {
         do_cleanup(0);
         set_metadata_to(
             Some(new_metadata),
-            MetadataFlags::FORCE | MetadataFlags::KEEP_REFS,
+            SetMetadataFlags::FORCE | SetMetadataFlags::KEEP_REFS,
             "update",
         )
         .unwrap();
@@ -652,7 +652,7 @@ fn get_previous_metadata(metadata: CommitId) -> Option<CommitId> {
 
 bitflags! {
     #[derive(Debug)]
-    pub struct MetadataFlags: i32 {
+    pub struct SetMetadataFlags: i32 {
         const FORCE = 0x1;
         const KEEP_REFS = 0x2;
     }
@@ -660,12 +660,12 @@ bitflags! {
 
 fn set_metadata_to(
     new_metadata: Option<CommitId>,
-    flags: MetadataFlags,
+    flags: SetMetadataFlags,
     msg: &str,
 ) -> Result<Option<CommitId>, String> {
     let mut refs = HashMap::new();
     for_each_ref_in(REFS_PREFIX, |r, oid| {
-        if flags.contains(MetadataFlags::KEEP_REFS)
+        if flags.contains(SetMetadataFlags::KEEP_REFS)
             && (r.as_bytes().starts_with_str("refs/")
                 || r.as_bytes().starts_with_str("hg/")
                 || r == "HEAD")
@@ -724,7 +724,7 @@ fn set_metadata_to(
 
         let mut m = metadata;
         let found = flags
-            .contains(MetadataFlags::FORCE)
+            .contains(SetMetadataFlags::FORCE)
             .then(|| {
                 state = MetadataState::Unknown;
                 new
@@ -1526,9 +1526,9 @@ fn do_rollback(
         return Err("Nothing to rollback.".to_string());
     };
     let flags = if force {
-        MetadataFlags::FORCE
+        SetMetadataFlags::FORCE
     } else {
-        MetadataFlags::empty()
+        SetMetadataFlags::empty()
     };
     set_metadata_to(wanted_metadata, flags, "rollback").map(|_| ())
 }
diff --git a/src/store.rs b/src/store.rs
index 6ecf787e3..1de99dd91 100644
--- a/src/store.rs
+++ b/src/store.rs
@@ -16,6 +16,7 @@ use std::rc::Rc;
 use std::sync::Mutex;
 
 use bit_vec::BitVec;
+use bitflags::bitflags;
 use bstr::{BStr, BString, ByteSlice};
 use derive_more::Deref;
 use either::Either;
@@ -65,13 +66,18 @@ pub const CHECKED_REF: &str = "refs/cinnabar/checked";
 pub const BROKEN_REF: &str = "refs/cinnabar/broken";
 pub const NOTES_REF: &str = "refs/notes/cinnabar";
 
-pub static mut METADATA_FLAGS: c_int = 0;
+bitflags! {
+    #[derive(Debug, Copy, Clone)]
+    pub struct MetadataFlags: i32 {
+        const FILES_META = 0x1;
+        const UNIFIED_MANIFESTS_V2 = 0x2;
 
-pub const FILES_META: c_int = 0x1;
-pub const UNIFIED_MANIFESTS_V2: c_int = 0x2;
+    }
+}
+pub static mut METADATA_FLAGS: MetadataFlags = MetadataFlags::empty();
 
 pub fn has_metadata() -> bool {
-    unsafe { METADATA_FLAGS != 0 }
+    unsafe { !METADATA_FLAGS.is_empty() }
 }
 
 macro_rules! hg2git {
@@ -2098,16 +2104,19 @@ pub unsafe extern "C" fn init_metadata(c: *const commit) {
     for flag in c.body().split(|&b| b == b' ') {
         match flag {
             b"files-meta" => {
-                METADATA_FLAGS |= FILES_META;
+                METADATA_FLAGS.insert(MetadataFlags::FILES_META);
             }
             b"unified-manifests" => old_metadata(),
             b"unified-manifests-v2" => {
-                METADATA_FLAGS |= UNIFIED_MANIFESTS_V2;
+                METADATA_FLAGS.insert(MetadataFlags::UNIFIED_MANIFESTS_V2);
             }
             _ => new_metadata(),
         }
     }
-    if METADATA_FLAGS != FILES_META | UNIFIED_MANIFESTS_V2 {
+    if !METADATA_FLAGS
+        .difference(MetadataFlags::FILES_META | MetadataFlags::UNIFIED_MANIFESTS_V2)
+        .is_empty()
+    {
         old_metadata();
     }
     let mut count = 0;