diff --git a/Kernel/Syscalls/select.cpp b/Kernel/Syscalls/select.cpp
index 0b7014eb8be..def1cc2c957 100644
--- a/Kernel/Syscalls/select.cpp
+++ b/Kernel/Syscalls/select.cpp
@@ -74,7 +74,7 @@ KResultOr<int> Process::sys$select(Userspace<const Syscall::SC_select_params*> u
         return EFAULT;
 
     Thread::SelectBlocker::FDVector fds_info;
-    Vector<int> fds;
+    Vector<int, FD_SETSIZE> fds;
     for (int fd = 0; fd < params.nfds; fd++) {
         u32 block_flags = (u32)Thread::FileBlocker::BlockFlags::None;
         if (params.readfds && FD_ISSET(fd, &fds_read))
diff --git a/Kernel/Thread.h b/Kernel/Thread.h
index a40ee397486..2fd7f2ea180 100644
--- a/Kernel/Thread.h
+++ b/Kernel/Thread.h
@@ -530,7 +530,7 @@ public:
 
     class FileBlocker : public Blocker {
     public:
-        enum class BlockFlags : u32 {
+        enum class BlockFlags : u16 {
             None = 0,
 
             Read = 1 << 0,
@@ -632,7 +632,7 @@ public:
     public:
         struct FDInfo {
             NonnullRefPtr<FileDescription> description;
-            BlockFlags block_flags;
+            BlockFlags block_flags { BlockFlags::None };
             BlockFlags unblocked_flags { BlockFlags::None };
         };