diff --git a/src/tools/fs_shell/vfs.cpp b/src/tools/fs_shell/vfs.cpp
index 27e73b8569..59ba2d249f 100644
--- a/src/tools/fs_shell/vfs.cpp
+++ b/src/tools/fs_shell/vfs.cpp
@@ -3697,7 +3697,7 @@ common_lock_node(int fd, bool kernel)
 
 	// We need to set the locking atomically - someone
 	// else might set one at the same time
-#ifdef __x86_64__
+#if LONG_MAX == INT_MAX
 	if (fssh_atomic_test_and_set64((int64_t *)&vnode->mandatory_locked_by,
 			(fssh_addr_t)descriptor, 0) != 0)
 #else