diff --git a/src/cpu/x86/early_reset.S b/src/cpu/x86/early_reset.S
index 6ce9d52a6d..07e63f42de 100644
--- a/src/cpu/x86/early_reset.S
+++ b/src/cpu/x86/early_reset.S
@@ -7,6 +7,7 @@
 
 #include <cpu/x86/mtrr.h>
 
+.code32
 .section .text
 .global check_mtrr