diff --git a/src/rpl/dll.h b/src/rpl/dll.h
index c83b350..37acf96 100644
--- a/src/rpl/dll.h
+++ b/src/rpl/dll.h
@@ -41,19 +41,18 @@
  */
 typedef struct rpl_dll* rpl_dll_t;
 
-
 /**
  * Create a new DLL loader object.
  * @return DLL loader object.
  */
-rpl_dll_t
+RPL_SYM rpl_dll_t
 rpl_dll_new(void);
 
 /**
  * Free DLL loader object.
  * @param dll pointer to DLL loader object.
  */
-void
+RPL_SYM void
 rpl_dll_free(rpl_dll_t* dll);
 
 /**
@@ -64,7 +63,7 @@ rpl_dll_free(rpl_dll_t* dll);
  * In the latter case the error code/message can be retrieved
  * using rpl_error_get/rpl_error_translate_last.
  */
-rpl_bool_t
+RPL_SYM rpl_bool_t
 rpl_dll_open(rpl_dll_t dll, const char* file);
 
 /**
@@ -74,7 +73,7 @@ rpl_dll_open(rpl_dll_t dll, const char* file);
  * In the latter case the error code/message can be retrieved
  * using rpl_error_get/rpl_error_translate_last.
  */
-rpl_bool_t
+RPL_SYM rpl_bool_t
 rpl_dll_close(rpl_dll_t dll);
 
 /**
@@ -85,7 +84,7 @@ rpl_dll_close(rpl_dll_t dll);
  * In the latter case the error code/message can be retrieved
  * using rpl_error_get/rpl_error_translate_last.
  */
-void*
+RPL_SYM void*
 rpl_dll_get(rpl_dll_t dll, const char* symbol_name);
 
 /** @} */
diff --git a/src/rpl/memory/tlsf.h b/src/rpl/memory/tlsf.h
index 7250303..dfc3508 100644
--- a/src/rpl/memory/tlsf.h
+++ b/src/rpl/memory/tlsf.h
@@ -16,8 +16,8 @@
  *
  */
 
-#ifndef _TLSF_H_
-#define _TLSF_H_
+#ifndef RPL_MEMORY_TLSF_H_INCLUDED_
+#define RPL_MEMORY_TLSF_H_INCLUDED_
 
 #include <sys/types.h>
 
@@ -34,11 +34,18 @@ extern "C" {
   extern void free_ex(void *, void *);
   extern void *realloc_ex(void *, size_t, void *);
   extern void *calloc_ex(size_t, size_t, void *);
-  
-  extern void *tlsf_malloc(size_t size);
-  extern void tlsf_free(void *ptr);
-  extern void *tlsf_realloc(void *ptr, size_t size);
-  extern void *tlsf_calloc(size_t nelem, size_t elem_size);
+
+  extern void*
+  tlsf_malloc(size_t size);
+
+  extern void
+  tlsf_free(void *ptr);
+
+  extern void*
+  tlsf_realloc(void *ptr, size_t size);
+
+  extern void*
+  tlsf_calloc(size_t nelem, size_t elem_size);
 
 #ifdef __cplusplus
 }
diff --git a/src/rpl/network/udp_socket.h b/src/rpl/network/udp_socket.h
index 5854851..7856c0d 100644
--- a/src/rpl/network/udp_socket.h
+++ b/src/rpl/network/udp_socket.h
@@ -51,8 +51,8 @@ rpl_udp_socket_free(rpl_udp_socket_t socket);
 RPL_SYM void
 rpl_udp_socket_free(rpl_udp_socket_t socket);
 
-RPL_SYM void
-rpl_udp_bcast_enable(rpl_udp_socket_t socket, rpl_bool_t enable);
+RPL_SYM rpl_bool_t
+rpl_udp_set_bcast(rpl_udp_socket_t socket, rpl_bool_t enabled);
 
 RPL_SYM void
 rpl_udp_set_mcast_ttl(rpl_udp_socket_t socket, rpl_uint8_t ttl);