diff --git a/Makefile b/Makefile
index cf0f49e35..a6ac1121a 100644
--- a/Makefile
+++ b/Makefile
@@ -147,10 +147,10 @@ kernel-x86_64.elf: $(X86ASM) FORCE
 	python3 scripts/embed_debug_info.py $@
 
 x86_64_boot.img: kernel-x86_64.elf
-	RUSTFLAGS="$(RUSTC_MISC_ARGS)" cargo +$(RUSTV) run --release --package x86bootdisk -- --kernel $< --output $@
+	RUSTFLAGS="$(RUSTC_MISC_ARGS)" cargo +$(RUSTV) run --release --package x86bootdisk --no-default-features --features bios -- --kernel $< --output $@
 
 x86_64_uefi.img: kernel-x86_64.elf
-	RUSTFLAGS="$(RUSTC_MISC_ARGS)" cargo +$(RUSTV) run --release --package x86bootdisk -- --kernel $< --output $@ --pxe x86_64_uefi_pxe_boot --boot-type uefi
+	RUSTFLAGS="$(RUSTC_MISC_ARGS)" cargo +$(RUSTV) run --release --package x86bootdisk --no-default-features --features uefi -- --kernel $< --output $@ --pxe x86_64_uefi_pxe_boot --boot-type uefi
 
 $(X86ASM): FORCE
 	$(MAKE) -C $@
diff --git a/mdbook/book.toml b/mdbook/book.toml
index 8f5c1c4a3..4bf31f613 100644
--- a/mdbook/book.toml
+++ b/mdbook/book.toml
@@ -1,7 +1,6 @@
 [book]
 authors = ["Yuuki Takano"]
 language = "en"
-multilingual = false
 src = "src"
 title = "Awkernel"
 
diff --git a/x86bootdisk/Cargo.toml b/x86bootdisk/Cargo.toml
index 563cbb660..49afc75ae 100644
--- a/x86bootdisk/Cargo.toml
+++ b/x86bootdisk/Cargo.toml
@@ -5,8 +5,13 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+default = ["bios", "uefi"]
+bios = ["bootloader/bios"]
+uefi = ["bootloader/uefi"]
+
 [dependencies]
-bootloader = "0.11"
+bootloader = { version = "0.11", default-features = false }
 ovmf-prebuilt = "0.2"
 clap = { version = "4.2", features = ["derive"] }
 home = "0.5"
diff --git a/x86bootdisk/src/main.rs b/x86bootdisk/src/main.rs
index 5098d11d3..37a3899df 100644
--- a/x86bootdisk/src/main.rs
+++ b/x86bootdisk/src/main.rs
@@ -1,14 +1,35 @@
-use bootloader::{BiosBoot, UefiBoot};
 use clap::Parser;
 use ovmf_prebuilt::{Prebuilt, Source};
 use std::{fs::File, io::Write, path::Path};
 
+#[cfg(not(any(feature = "bios", feature = "uefi")))]
+compile_error!("At least one of the `bios` or `uefi` features must be enabled.");
+
+#[cfg(feature = "bios")]
+use bootloader::BiosBoot;
+#[cfg(feature = "uefi")]
+use bootloader::UefiBoot;
+
 #[derive(Debug, clap::ValueEnum, Clone)]
 enum BootType {
+    #[cfg(feature = "uefi")]
     Uefi,
+    #[cfg(feature = "bios")]
     Bios,
 }
 
+impl Default for BootType {
+    #[cfg(feature = "bios")]
+    fn default() -> Self {
+        Self::Bios
+    }
+
+    #[cfg(all(not(feature = "bios"), feature = "uefi"))]
+    fn default() -> Self {
+        Self::Uefi
+    }
+}
+
 /// Simple program to greet a person
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
@@ -26,7 +47,7 @@ struct Args {
     pxe: String,
 
     /// uefi or bios.
-    #[arg(value_enum, long, default_value_t = BootType::Bios)]
+    #[arg(value_enum, long, default_value_t = BootType::default())]
     boot_type: BootType,
 }
 
@@ -38,6 +59,7 @@ fn main() {
     let pxe_path = Path::new(&args.pxe);
 
     match args.boot_type {
+        #[cfg(feature = "uefi")]
         BootType::Uefi => {
             let uefi = UefiBoot::new(kernel_path);
             uefi.create_disk_image(output_path).unwrap();
@@ -61,6 +83,7 @@ fn main() {
                 output_path.display()
             )
         }
+        #[cfg(feature = "bios")]
         BootType::Bios => {
             BiosBoot::new(kernel_path)
                 .create_disk_image(output_path)