diff --git a/cpu/msp430/cc2420-arch-sfd.c b/cpu/msp430/cc2420-arch-sfd.c
index 49c979ce2..f7535b276 100644
--- a/cpu/msp430/cc2420-arch-sfd.c
+++ b/cpu/msp430/cc2420-arch-sfd.c
@@ -59,7 +59,7 @@ void
 cc2420_arch_sfd_init(void)
 {
   /* Need to select the special function! */
-  P4SEL = BV(CC2420_SFD_PIN);
+  CC2420_SFD_PORT(SEL) = BV(CC2420_SFD_PIN);
   
   /* start timer B - 32768 ticks per second */
   TBCTL = TBSSEL_1 | TBCLR;
diff --git a/cpu/msp430/cc2520-arch-sfd.c b/cpu/msp430/cc2520-arch-sfd.c
index 5eb35cedb..bafa11b1c 100644
--- a/cpu/msp430/cc2520-arch-sfd.c
+++ b/cpu/msp430/cc2520-arch-sfd.c
@@ -58,7 +58,7 @@ void
 cc2520_arch_sfd_init(void)
 {
   /* Need to select the special function! */
-  P4SEL = BV(CC2520_SFD_PIN);
+  CC2520_SFD_PORT(SEL) = BV(CC2520_SFD_PIN);
 
   /* start timer B - 32768 ticks per second */
   TBCTL = TBSSEL_1 | TBCLR;