diff --git a/Kernel/Storage/StorageDevice.cpp b/Kernel/Storage/StorageDevice.cpp
index c277498136..ac1475abf3 100644
--- a/Kernel/Storage/StorageDevice.cpp
+++ b/Kernel/Storage/StorageDevice.cpp
@@ -189,8 +189,8 @@ ErrorOr<void> StorageDevice::ioctl(OpenFileDescription&, unsigned request, Users
 {
     switch (request) {
     case STORAGE_DEVICE_GET_SIZE: {
-        size_t disk_size = m_max_addressable_block * block_size();
-        return copy_to_user(static_ptr_cast<size_t*>(arg), &disk_size);
+        u64 disk_size = m_max_addressable_block * block_size();
+        return copy_to_user(static_ptr_cast<u64*>(arg), &disk_size);
         break;
     }
     case STORAGE_DEVICE_GET_BLOCK_SIZE: {
diff --git a/Userland/Utilities/blockdev.cpp b/Userland/Utilities/blockdev.cpp
index f911347ac4..14e87250ed 100644
--- a/Userland/Utilities/blockdev.cpp
+++ b/Userland/Utilities/blockdev.cpp
@@ -10,11 +10,10 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <sys/ioctl.h>
-#include <unistd.h>
 
 static void fetch_ioctl(int fd, int request)
 {
-    size_t value;
+    u64 value;
     if (ioctl(fd, request, &value) < 0) {
         perror("ioctl");
         exit(1);