diff --git a/core/net/mac/contikimac.c b/core/net/mac/contikimac.c
index 78c766d4d..628be7ee4 100644
--- a/core/net/mac/contikimac.c
+++ b/core/net/mac/contikimac.c
@@ -736,7 +736,7 @@ qsend_packet(mac_callback_t sent, void *ptr)
   }
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 qsend_list(mac_callback_t sent, void *ptr, struct rdc_buf_list *buf_list)
 {
   struct rdc_buf_list *curr = buf_list;
diff --git a/core/net/mac/cxmac.c b/core/net/mac/cxmac.c
index 61d942813..4e1c336fb 100644
--- a/core/net/mac/cxmac.c
+++ b/core/net/mac/cxmac.c
@@ -699,7 +699,7 @@ qsend_packet(mac_callback_t sent, void *ptr)
   mac_call_sent_callback(sent, ptr, ret, 1);
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 qsend_list(mac_callback_t sent, void *ptr, struct rdc_buf_list *buf_list)
 {
   if(buf_list != NULL) {
diff --git a/core/net/mac/lpp.c b/core/net/mac/lpp.c
index 11b73c370..7b5188d6f 100644
--- a/core/net/mac/lpp.c
+++ b/core/net/mac/lpp.c
@@ -726,7 +726,7 @@ send_packet(mac_callback_t sent, void *ptr)
   }
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 send_list(mac_callback_t sent, void *ptr, struct rdc_buf_list *buf_list)
 {
   if(buf_list != NULL) {
diff --git a/core/net/mac/nullrdc-noframer.c b/core/net/mac/nullrdc-noframer.c
index 38fd246fb..1fa0249bb 100644
--- a/core/net/mac/nullrdc-noframer.c
+++ b/core/net/mac/nullrdc-noframer.c
@@ -56,7 +56,7 @@ send_packet(mac_callback_t sent, void *ptr)
   mac_call_sent_callback(sent, ptr, ret, 1);
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 send_list(mac_callback_t sent, void *ptr, struct rdc_buf_list *buf_list)
 {
   if(buf_list != NULL) {
diff --git a/core/net/mac/nullrdc.c b/core/net/mac/nullrdc.c
index c705e64f3..9783249a5 100644
--- a/core/net/mac/nullrdc.c
+++ b/core/net/mac/nullrdc.c
@@ -201,7 +201,7 @@ send_packet(mac_callback_t sent, void *ptr)
   mac_call_sent_callback(sent, ptr, ret, 1);
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 send_list(mac_callback_t sent, void *ptr, struct rdc_buf_list *buf_list)
 {
   if(buf_list != NULL) {
diff --git a/core/net/mac/xmac.c b/core/net/mac/xmac.c
index 864089ecc..7b03bf055 100644
--- a/core/net/mac/xmac.c
+++ b/core/net/mac/xmac.c
@@ -763,7 +763,7 @@ qsend_packet(mac_callback_t sent, void *ptr)
   mac_call_sent_callback(sent, ptr, ret, 1);
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 qsend_list(mac_callback_t sent, void *ptr, struct rdc_buf_list *buf_list)
 {
   if(buf_list != NULL) {