diff --git a/native/tests/test_dataset_hash.cpp b/native/tests/test_dataset_hash.cpp
index 0f2256b..0a16506 100644
--- a/native/tests/test_dataset_hash.cpp
+++ b/native/tests/test_dataset_hash.cpp
@@ -248,8 +248,8 @@ int test_performance() {
     auto create_time = duration_cast<milliseconds>(create_end - start);
     auto hash_time = duration_cast<milliseconds>(hash_end - create_end);
     
-    printf("  Created %d files in %ld ms\n", num_files, create_time.count());
-    printf("  Hashed %d files in %ld ms\n", num_files, hash_time.count());
+    printf("  Created %d files in %lld ms\n", num_files, create_time.count());
+    printf("  Hashed %d files in %lld ms\n", num_files, hash_time.count());
     printf("  Throughput: %.1f files/sec\n", num_files * 1000.0 / hash_time.count());
     
     fh_free_string(hash);