diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index 9a277aeee..927c32846 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -124,8 +124,8 @@ struct gsm_nm_state {
  */
 struct gsm_loc_updating_operation {
         struct timer_list updating_timer;
-	int waiting_for_imsi : 1;
-	int waiting_for_imei : 1;
+	unsigned int waiting_for_imsi : 1;
+	unsigned int waiting_for_imei : 1;
 };
 
 #define MAX_A5_KEY_LEN	(128/8)
diff --git a/openbsc/include/openbsc/timer.h b/openbsc/include/openbsc/timer.h
index a1ad92cfc..fee888bfd 100644
--- a/openbsc/include/openbsc/timer.h
+++ b/openbsc/include/openbsc/timer.h
@@ -44,9 +44,9 @@
 struct timer_list {
 	struct llist_head entry;
 	struct timeval timeout;
-	int active  : 1;
-	int handled : 1;
-	int in_list : 1;
+	unsigned int active  : 1;
+	unsigned int handled : 1;
+	unsigned int in_list : 1;
 
 	void (*cb)(void*);
 	void *data;