diff --git a/artiq/firmware/Cargo.toml b/artiq/firmware/Cargo.toml
index 8ab755b00..1d2f871f3 100644
--- a/artiq/firmware/Cargo.toml
+++ b/artiq/firmware/Cargo.toml
@@ -3,4 +3,5 @@ members = ["bootloader", "runtime", "ksupport", "satman"]
 
 [profile.dev]
 incremental = false # incompatible with LTO
+lto = true
 debug = 2
diff --git a/artiq/firmware/bootloader/Makefile b/artiq/firmware/bootloader/Makefile
index f247c0994..ee70ff22f 100644
--- a/artiq/firmware/bootloader/Makefile
+++ b/artiq/firmware/bootloader/Makefile
@@ -7,8 +7,7 @@ all:: bootloader.bin
 
 .PHONY: $(RUSTOUT)/libbootloader.a
 $(RUSTOUT)/libbootloader.a:
-	$(cargo) --manifest-path $(BOOTLOADER_DIRECTORY)/Cargo.toml -- \
-		-Clto
+	$(cargo) --manifest-path $(BOOTLOADER_DIRECTORY)/Cargo.toml
 
 bootloader.elf: $(RUSTOUT)/libbootloader.a
 	$(link) -T $(BOOTLOADER_DIRECTORY)/bootloader.ld