diff --git a/src/cpu/x86/64bit/Makefile.inc b/src/cpu/x86/64bit/Makefile.inc
index 526291a..36c69b9 100644
--- a/src/cpu/x86/64bit/Makefile.inc
+++ b/src/cpu/x86/64bit/Makefile.inc
@@ -1,8 +1,4 @@
-bootblock-y += mode_switch.S
-verstage_x86-y += mode_switch.S
-romstage-y += mode_switch.S
-postcar-y += mode_switch.S
-ramstage-y += mode_switch.S
+all_x86-y += mode_switch.S
 
 # Add --defsym=_start=0 to suppress a linker warning.
 $(objcbfs)/pt: $(dir)/pt.S $(obj)/config.h