diff --git a/tests/compatible/disk/common.py b/tests/compatible/disk/common.py
index b7127a7595754f98475770f5e62cc0d87ff82d18..690893febaa9d0e5daafc66184c8ce8a00473343 100644
--- a/tests/compatible/disk/common.py
+++ b/tests/compatible/disk/common.py
@@ -146,7 +146,7 @@ def vfs_test(logger, command, disk, filesystems):
     if not os.path.exists(proc_path):
         proc_path = os.path.join("/sys/block/*/", disk)
     size = getoutput("cat %s/size" % proc_path)
-    size = int(size) / 2 / 2
+    size = int(size) / 2
     if size <= 0:
         logger.error(
             "Device %s size is not suitable for testing." % device)