diff --git a/src/mesh/mesh_lower_transport.h b/src/mesh/mesh_lower_transport.h
index 0176a9eeb..ad1d43697 100644
--- a/src/mesh/mesh_lower_transport.h
+++ b/src/mesh/mesh_lower_transport.h
@@ -93,7 +93,7 @@ void mesh_transport_set_src(mesh_transport_pdu_t * transport_pdu, uint16_t src);
 void mesh_transport_set_dest(mesh_transport_pdu_t * transport_pdu, uint16_t dest);
 
 
-void mesh_lower_transport_init();
+void mesh_lower_transport_init(void);
 void mesh_lower_transport_set_higher_layer_handler(void (*pdu_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu));
 
 void mesh_lower_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu);
diff --git a/src/mesh/mesh_upper_transport.h b/src/mesh/mesh_upper_transport.h
index 5f94ab7d4..a05e00cf4 100644
--- a/src/mesh/mesh_upper_transport.h
+++ b/src/mesh/mesh_upper_transport.h
@@ -50,7 +50,7 @@ extern "C"
 #include "mesh/mesh_network.h"
 #include "mesh/mesh_lower_transport.h"
 
-void mesh_upper_transport_init();
+void mesh_upper_transport_init(void);
 
 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu);