diff --git a/boards/telosb/driver_cc2420.c b/boards/telosb/driver_cc2420.c
index 8b3510645a..594b9f3374 100644
--- a/boards/telosb/driver_cc2420.c
+++ b/boards/telosb/driver_cc2420.c
@@ -96,7 +96,7 @@ int cc2420_get_gio1(void)
     return CC2420_GIO1;
 }
 
-int cc2420_get_fifop(void)
+uint8_t cc2420_get_fifop(void)
 {
     return CC2420_FIFOP;
 }
diff --git a/boards/wsn430-v1_4/driver_cc2420.c b/boards/wsn430-v1_4/driver_cc2420.c
index 38bdcc0f2b..06f303efd6 100644
--- a/boards/wsn430-v1_4/driver_cc2420.c
+++ b/boards/wsn430-v1_4/driver_cc2420.c
@@ -104,6 +104,11 @@ uint8_t cc2420_get_sfd(void)
     return CC2420_SFD;
 }
 
+uint8_t cc2420_get_fifop(void)
+{
+    return CC2420_GDO2;
+}
+
 uint8_t cc2420_get_cca(void)
 {
     uint8_t status;
diff --git a/boards/z1/driver_cc2420.c b/boards/z1/driver_cc2420.c
index f1aa002e2d..20a1e8b23c 100644
--- a/boards/z1/driver_cc2420.c
+++ b/boards/z1/driver_cc2420.c
@@ -111,7 +111,7 @@ int cc2420_get_gio1(void)
     return CC2420_GIO1;
 }
 
-int cc2420_get_fifop(void)
+uint8_t cc2420_get_fifop(void)
 {
     return CC2420_FIFOP;
 }