diff --git a/src/add-ons/kernel/file_systems/nfs4/Inode.cpp b/src/add-ons/kernel/file_systems/nfs4/Inode.cpp
index 7014a8490b..53a76a453f 100644
--- a/src/add-ons/kernel/file_systems/nfs4/Inode.cpp
+++ b/src/add-ons/kernel/file_systems/nfs4/Inode.cpp
@@ -739,7 +739,7 @@ Inode::AcquireLock(OpenFileCookie* cookie, const struct flock* lock,
 
 	linfo->fSequence = 0;
 	linfo->fStart = lock->l_start;
-	if (lock->l_len == OFF_MAX)
+	if (lock->l_len + lock->l_start == OFF_MAX)
 		linfo->fLength = UINT64_MAX;
 	else
 		linfo->fLength = lock->l_len;