diff --git a/libowlps/libowlps.c b/libowlps/libowlps.c
index bc7edeb..a8cb571 100644
--- a/libowlps/libowlps.c
+++ b/libowlps/libowlps.c
@@ -107,11 +107,15 @@ void owl_timestamp_now(TIMESTAMP *now)
 int owl_timestamp_now_ns(TIMESTAMP *now)
 {
   int ret ;
-  if ((ret = clock_gettime(CLOCK_REALTIME, now)))
+  struct timespec now_ts ;
+  if ((ret = clock_gettime(CLOCK_REALTIME, &now_ts)))
     {
       perror("Cannot get the current time") ;
       return ret ;
     }
+
+  *now = owl_timespec_to_timestamp(now_ts) ;
+
   return 0 ;
 }
 
@@ -127,6 +131,19 @@ void owl_timestamp_round_to_ms(TIMESTAMP *now)
 
 
 
+/*
+ * Returns a TIMESTAMP from a struct timespec.
+ */
+TIMESTAMP owl_timespec_to_timestamp(const struct timespec d)
+{
+  TIMESTAMP res ;
+  res.tv_sec = d.tv_sec ;
+  res.tv_nsec = d.tv_nsec ;
+  return res ;
+}
+
+
+
 /*
  * Returns a TIMESTAMP from a struct timeval.
  */
diff --git a/libowlps/owlps.h b/libowlps/owlps.h
index 51fe315..c0944df 100644
--- a/libowlps/owlps.h
+++ b/libowlps/owlps.h
@@ -60,8 +60,12 @@ typedef enum {FALSE, TRUE} BOOL ;
 typedef enum {NORTH = 1, EAST, SOUTH, WEST} DIRECTION ;
 
 
-/* Timestamp type */
-typedef struct timespec TIMESTAMP ;
+/* Timestamp type (struct timespec clone with fix-sized fields) */
+typedef struct _TIMESTAMP
+{
+  uint32_t tv_sec ;
+  uint32_t tv_nsec ;
+} TIMESTAMP ;
 
 
 /* Message sent by the listener to the aggregator */
@@ -226,6 +230,7 @@ uint_fast8_t owl_frequency_to_channel(uint_fast16_t channel) ;
 void owl_timestamp_now(TIMESTAMP *now) ;
 int owl_timestamp_now_ns(TIMESTAMP *now) ;
 void owl_timestamp_round_to_ms(TIMESTAMP *now) ;
+TIMESTAMP owl_timespec_to_timestamp(const struct timespec d) ;
 TIMESTAMP owl_timeval_to_timestamp(const struct timeval d) ;
 uint64_t owl_timestamp_to_ms(TIMESTAMP date) ;
 uint_fast32_t owl_time_elapsed(TIMESTAMP sup, TIMESTAMP inf) ;