diff --git a/arch/um/Makefile-x86_64 b/arch/um/Makefile-x86_64
index dfd88b6..dffd118 100644
--- a/arch/um/Makefile-x86_64
+++ b/arch/um/Makefile-x86_64
@@ -6,9 +6,11 @@
 
 #We #undef __x86_64__ for kernelspace, not for userspace where
 #it's needed for headers to work!
-CFLAGS += -U__$(SUBARCH)__ -fno-builtin
-USER_CFLAGS += -fno-builtin
+CFLAGS += -U__$(SUBARCH)__ -fno-builtin -m64
+USER_CFLAGS += -fno-builtin -m64
 CHECKFLAGS  += -m64
+AFLAGS += -m64
+LDFLAGS += -m elf_x86_64
 
 ELF_ARCH := i386:x86-64
 ELF_FORMAT := elf64-x86-64
@@ -16,3 +18,4 @@
 # Not on all 64-bit distros /lib is a symlink to /lib64. PLD is an example.
 
 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib64
+LINK-y += -m64
diff --git a/arch/um/kernel/vmlinux.lds.S b/arch/um/kernel/vmlinux.lds.S
index 1660a76..0a7d50f 100644
--- a/arch/um/kernel/vmlinux.lds.S
+++ b/arch/um/kernel/vmlinux.lds.S
@@ -1,4 +1,6 @@
 #include <linux/config.h>
+/* in case the preprocessor is a 32bit one */
+#undef i386
 #ifdef CONFIG_LD_SCRIPT_STATIC
 #include "uml.lds.S"
 #else