diff --git a/src/fs/btrfs.cpp b/src/fs/btrfs.cpp
index 1866b03..32b41ed 100644
--- a/src/fs/btrfs.cpp
+++ b/src/fs/btrfs.cpp
@@ -91,7 +91,7 @@ FileSystem::SupportTool btrfs::supportToolName() const
 
 qint64 btrfs::minCapacity() const
 {
-    return 256 * Capacity::unitFactor(Capacity::Byte, Capacity::MiB);
+    return 40 * Capacity::unitFactor(Capacity::Byte, Capacity::MiB);
 }
 
 qint64 btrfs::maxCapacity() const