diff --git a/src/add-ons/kernel/file_systems/nfs4/RootInode.cpp b/src/add-ons/kernel/file_systems/nfs4/RootInode.cpp
index ed9dee0615..73edd0e09b 100644
--- a/src/add-ons/kernel/file_systems/nfs4/RootInode.cpp
+++ b/src/add-ons/kernel/file_systems/nfs4/RootInode.cpp
@@ -110,6 +110,8 @@ RootInode::_UpdateInfo(bool force)
 
 		if (ioSize == LONGLONG_MAX)
 			ioSize = 32768;
+		if (ioSize == 0)
+			ioSize = 4096;
 		fInfoCache.io_size = ioSize;
 		fInfoCache.block_size = ioSize;
 		fIOSize = ioSize;