diff --git a/mk/disk.mk b/mk/disk.mk
index 182ccfd..7a52d55 100644
--- a/mk/disk.mk
+++ b/mk/disk.mk
@@ -19,6 +19,7 @@ build/livedisk.iso: build/livedisk.bin.gz
 	isohybrid $@
 
 bootloader-coreboot/build/bootloader: build/kernel_coreboot
+	env --unset=RUST_TARGET_PATH --unset=RUSTUP_TOOLCHAIN --unset=XARGO_RUST_SRC \
 	$(MAKE) -C bootloader-coreboot clean build/bootloader KERNEL="$(ROOT)/$<"
 
 build/coreboot.elf: bootloader-coreboot/build/bootloader
@@ -26,8 +27,8 @@ build/coreboot.elf: bootloader-coreboot/build/bootloader
 	cp -v $< $@
 
 bootloader-efi/build/$(EFI_TARGET)/boot.efi: FORCE
-	cd bootloader-efi && \
-	$(MAKE) build/$(EFI_TARGET)/boot.efi TARGET=$(EFI_TARGET)
+	env --unset=RUST_TARGET_PATH --unset=RUSTUP_TOOLCHAIN --unset=XARGO_RUST_SRC \
+	$(MAKE) -C bootloader-efi build/$(EFI_TARGET)/boot.efi TARGET=$(EFI_TARGET)
 
 build/bootloader.efi: bootloader-efi/build/$(EFI_TARGET)/boot.efi
 	mkdir -p build