diff --git a/include/btstack/run_loop.h b/include/btstack/run_loop.h
index 080c27654..94fd8912c 100644
--- a/include/btstack/run_loop.h
+++ b/include/btstack/run_loop.h
@@ -41,10 +41,6 @@
 
 #include <sys/time.h>
 
-// flags for data_source
-#define DS_FLAG_ACTIVE 1
-#define DS_FLAG_POLL   2
-
 typedef enum {
 	RUN_LOOP_POSIX = 1,
 	RUN_LOOP_COCOA,
@@ -53,9 +49,8 @@ typedef enum {
 
 typedef struct data_source {
     linked_item_t item;
-    int  fd;                                 // <-- file descriptors to watch or 0
+    int  fd;                                 // <-- file descriptor to watch or 0
     int  (*process)(struct data_source *ds); // <-- do processing
-	int  flags;								 // <-- RL_FLAG
 } data_source_t;
 
 typedef struct timer {
@@ -67,13 +62,13 @@ typedef struct timer {
 // init must be called before any other run_loop call
 void run_loop_init(RUN_LOOP_TYPE type);
 
-// set timer based on current time
-void run_loop_set_timer(timer_source_t *a, int timeout_in_ms);
-
 // add/remove data_source
 void run_loop_add_data_source(data_source_t *dataSource);
 int  run_loop_remove_data_source(data_source_t *dataSource);
 
+// set timer based on current time
+void run_loop_set_timer(timer_source_t *a, int timeout_in_ms);
+
 // add/remove timer_source
 void run_loop_add_timer(timer_source_t *timer); 
 int  run_loop_remove_timer(timer_source_t *timer);