diff --git a/Base/usr/share/man/man2/mount.md b/Base/usr/share/man/man2/mount.md
index 3ece948f60..26b4c26710 100644
--- a/Base/usr/share/man/man2/mount.md
+++ b/Base/usr/share/man/man2/mount.md
@@ -90,6 +90,8 @@ launch the initial userspace process.
   file-backed filesystem (and not a pseudo filesystem), or `MS_BIND` is
   specified in flags.
 * `ENOTDIR`: If `target` is not a directory.
+* `ENOTBLK`: If the `source_fd` is not a block device, but one is required (i.e.
+  when `fs_type` is `Ext2FS`)
 
 All of the usual path resolution errors may also occur.
 
diff --git a/Kernel/Syscalls/mount.cpp b/Kernel/Syscalls/mount.cpp
index 5376563530..30df65543b 100644
--- a/Kernel/Syscalls/mount.cpp
+++ b/Kernel/Syscalls/mount.cpp
@@ -91,6 +91,8 @@ int Process::sys$mount(Userspace<const Syscall::SC_mount_params*> user_params)
     if (fs_type == "ext2" || fs_type == "Ext2FS") {
         if (description.is_null())
             return -EBADF;
+        if (!description->file().is_block_device())
+            return -ENOTBLK;
         if (!description->file().is_seekable()) {
             dbgln("mount: this is not a seekable file");
             return -ENODEV;