diff -uNr keepassxc-2.6.6/src/core/FileWatcher.cpp keepassxc-2.6.6.mod/src/core/FileWatcher.cpp
--- keepassxc-2.6.6/src/core/FileWatcher.cpp	2021-06-12 05:13:52.000000000 +0300
+++ keepassxc-2.6.6.mod/src/core/FileWatcher.cpp	2021-07-25 20:21:11.853398555 +0300
@@ -47,8 +47,9 @@
 #if defined(Q_OS_LINUX)
     struct statfs statfsBuf;
     bool forcePolling = false;
+#ifndef NFS_SUPER_MAGIC
     const auto NFS_SUPER_MAGIC = 0x6969;
-
+#endif
     if (!statfs(filePath.toLocal8Bit().constData(), &statfsBuf)) {
         forcePolling = (statfsBuf.f_type == NFS_SUPER_MAGIC);
     } else {