diff --git a/share/mk/bsd.cpu.mk b/share/mk/bsd.cpu.mk
index 2a735ddd519..e45dd48d99e 100644
--- a/share/mk/bsd.cpu.mk
+++ b/share/mk/bsd.cpu.mk
@@ -133,7 +133,7 @@ MACHINE_CPU = mmx k6 k5 i586 i486 i386
 .  elif ${CPUTYPE} == "k5"
 MACHINE_CPU = k5 i586 i486 i386
 .  elif ${CPUTYPE} == "c3"
-MACHINE_CPU = mmx i586 i486 i386
+MACHINE_CPU = 3dnow mmx i586 i486 i386
 .  elif ${CPUTYPE} == "c3-2"
 MACHINE_CPU = sse mmx i586 i486 i386
 .  elif ${CPUTYPE} == "pentium4" || ${CPUTYPE} == "pentium4m" || ${CPUTYPE} == "pentium-m"