diff --git a/bd2fs.py b/bd2fs.py
index 3ac1e45..89c3f67 100644
--- a/bd2fs.py
+++ b/bd2fs.py
@@ -124,15 +124,15 @@ class Bd2FsNodeServicer(csi_pb2_grpc.NodeServicer):
         return csi_pb2.NodeGetVolumeStatsResponse(
             usage=[
                 csi_pb2.VolumeUsage(
-                    available=stats["fs_free"],
+                    available=stats["fs_avail"],
                     total=stats["fs_size"],
-                    used=stats["fs_size"] - stats["fs_free"],
+                    used=stats["fs_size"] - stats["fs_avail"],
                     unit=csi_pb2.VolumeUsage.Unit.BYTES,
                 ),
                 csi_pb2.VolumeUsage(
-                    available=stats["fs_files_free"],
+                    available=stats["fs_files_avail"],
                     total=stats["fs_files"],
-                    used=stats["fs_files"] - stats["fs_files_free"],
+                    used=stats["fs_files"] - stats["fs_files_avail"],
                     unit=csi_pb2.VolumeUsage.Unit.INODES,
                 ),
             ]
diff --git a/metrics.py b/metrics.py
index 93a64a7..4876e3f 100644
--- a/metrics.py
+++ b/metrics.py
@@ -10,9 +10,9 @@ def path_stats(path):
     fs_stat = os.statvfs(path)
     return {
         "fs_size": fs_stat.f_frsize * fs_stat.f_blocks,
-        "fs_free": fs_stat.f_frsize * fs_stat.f_bfree,
+        "fs_avail": fs_stat.f_frsize * fs_stat.f_bavail,
         "fs_files": fs_stat.f_files,
-        "fs_files_free": fs_stat.f_ffree,
+        "fs_files_avail": fs_stat.f_favail,
     }