diff --git a/kernel/kernel/OpenFileDescriptorSet.cpp b/kernel/kernel/OpenFileDescriptorSet.cpp
index 24ab36aa..8693d6e7 100644
--- a/kernel/kernel/OpenFileDescriptorSet.cpp
+++ b/kernel/kernel/OpenFileDescriptorSet.cpp
@@ -55,7 +55,7 @@ namespace Kernel
 
 	BAN::ErrorOr<int> OpenFileDescriptorSet::open(BAN::StringView absolute_path, int flags)
 	{
-		if (flags & ~(O_RDONLY | O_WRONLY | O_NOFOLLOW | O_SEARCH | O_APPEND | O_TRUNC | O_CLOEXEC | O_TTY_INIT | O_DIRECTORY))
+		if (flags & ~(O_RDONLY | O_WRONLY | O_NOFOLLOW | O_SEARCH | O_APPEND | O_TRUNC | O_CLOEXEC | O_TTY_INIT | O_DIRECTORY | O_NONBLOCK))
 			return BAN::Error::from_errno(ENOTSUP);
 
 		int access_mask = O_EXEC | O_RDONLY | O_WRONLY | O_SEARCH;