diff --git a/arch/um/Makefile-x86_64 b/arch/um/Makefile-x86_64
index baddb5d64ca5..436abbba409b 100644
--- a/arch/um/Makefile-x86_64
+++ b/arch/um/Makefile-x86_64
@@ -8,6 +8,7 @@ START := 0x60000000
 #it's needed for headers to work!
 CFLAGS += -U__$(SUBARCH)__ -fno-builtin
 USER_CFLAGS += -fno-builtin
+CHECKFLAGS  += -m64
 
 ELF_ARCH := i386:x86-64
 ELF_FORMAT := elf64-x86-64
diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules
index 17f305b6bade..59a1291f477e 100644
--- a/arch/um/scripts/Makefile.rules
+++ b/arch/um/scripts/Makefile.rules
@@ -9,6 +9,11 @@ USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file))
 
 $(USER_OBJS) : c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) \
 	$(CFLAGS_$(notdir $@))
+$(USER_OBJS): cmd_checksrc =
+$(USER_OBJS): quiet_cmd_checksrc =
+$(USER_OBJS): cmd_force_checksrc =
+$(USER_OBJS): quiet_cmd_force_checksrc =
+
 
 # The stubs and unmap.o can't try to call mcount or update basic block data
 define unprofile