diff --git a/git_history/cli.py b/git_history/cli.py
index 973f7f1..f3a4c40 100644
--- a/git_history/cli.py
+++ b/git_history/cli.py
@@ -162,7 +162,7 @@ def file(
 
     namespace_id = db["namespaces"].lookup({"name": namespace})
 
-    commits_to_skip = get_commit_hashes(db)
+    commits_to_skip = get_commit_hashes(db, namespace)
     if skip_hashes:
         commits_to_skip.update(skip_hashes)
 
@@ -516,9 +516,20 @@ def create_views(db, namespace):
         )
 
 
-def get_commit_hashes(db):
+def get_commit_hashes(db, namespace):
     return (
-        set(r[0] for r in db.execute("select hash from commits").fetchall())
+        set(
+            r[0]
+            for r in db.execute(
+                """
+            select hash from commits
+            where namespace = (
+                select id from namespaces where name = ?
+            )
+        """,
+                [namespace],
+            ).fetchall()
+        )
         if db["commits"].exists()
         else set()
     )
diff --git a/tests/test_git_history.py b/tests/test_git_history.py
index 5d6979c..93dbc1b 100644
--- a/tests/test_git_history.py
+++ b/tests/test_git_history.py
@@ -466,6 +466,63 @@ def test_file_with_id_resume(repo, tmpdir, namespace):
     ]
 
 
+def test_file_with_id_resume_two_namespaces(repo, tmpdir):
+    # https://github.com/simonw/git-history/issues/43
+    runner = CliRunner()
+    db_path = str(tmpdir / "db.db")
+
+    def run(namespace):
+        result = runner.invoke(
+            cli,
+            [
+                "file",
+                db_path,
+                str(repo / "items.json"),
+                "--repo",
+                str(repo),
+                "--id",
+                "product_id",
+                "--namespace",
+                namespace,
+            ],
+        )
+        assert result.exit_code == 0
+
+    for namespace in ("one", "two"):
+        run(namespace)
+
+    # Now modify items.json, commit and run again
+    (repo / "items.json").write_text(
+        json.dumps(
+            [
+                {"product_id": 1, "name": "Gin"},
+                {"product_id": 2, "name": "Tonic 2"},
+                {"product_id": 3, "name": "Rum Pony"},
+            ]
+        ),
+        "utf-8",
+    )
+    subprocess.call(git_commit + ["-a", "-m", "another"], cwd=str(repo))
+    for namespace in ("one", "two"):
+        run(namespace)
+
+    db = sqlite_utils.Database(db_path)
+    assert set(db.table_names()) == {
+        "namespaces",
+        "commits",
+        "one",
+        "one_version",
+        "columns",
+        "one_changed",
+        "two",
+        "two_version",
+        "two_changed",
+    }
+    # Should be five versions: Gin, Tonic -> Tonic 2, Rum -> Rum Pony
+    assert db["one_version"].count == 5
+    assert db["two_version"].count == 5
+
+
 @pytest.mark.parametrize("namespace", (None, "custom"))
 def test_file_with_id_full_versions(repo, tmpdir, namespace):
     runner = CliRunner()