diff --git a/repos/base/mk/spec/x86_64.mk b/repos/base/mk/spec/x86_64.mk
index 8dbb698660..75e8602a06 100644
--- a/repos/base/mk/spec/x86_64.mk
+++ b/repos/base/mk/spec/x86_64.mk
@@ -9,7 +9,7 @@ SPECS += x86 64bit
 REP_INC_DIR += include/spec/x86
 REP_INC_DIR += include/spec/x86_64
 
-CC_MARCH ?= -m64 -mcmodel=large
+CC_MARCH ?= -m64 -mcmodel=large -march=x86-64-v2
 
 #
 # Avoid wasting almost 4 MiB by telling the linker that the max page size is