diff --git a/libowlps-client/libowlps-client.c b/libowlps-client/libowlps-client.c
index ff44774..669c12d 100644
--- a/libowlps-client/libowlps-client.c
+++ b/libowlps-client/libowlps-client.c
@@ -88,7 +88,7 @@ void owl_send_request(const int sockfd,
   // Transmit remaining packets (if any):
   for (i = 0 ; i < nb_pkt - 1 ; ++i)
     {
-      usleep(delay * 1000) ; // Wait during the wanted delay
+      owl_msleep(delay) ; // Wait during the wanted delay
       owl_send_packet(sockfd, server, packet, packet_size) ;
     }
 
diff --git a/owlps-aggregator/owlps-aggregatord.c b/owlps-aggregator/owlps-aggregatord.c
index 557a931..21cb4b4 100644
--- a/owlps-aggregator/owlps-aggregatord.c
+++ b/owlps-aggregator/owlps-aggregatord.c
@@ -711,7 +711,7 @@ void* monitor_requests(void *NULL_value)
 
       fflush(NULL) ;
       // Wait to check again:
-      usleep(cfg_getint(cfg, "check_interval") * 1000) ;
+      owl_msleep(cfg_getint(cfg, "check_interval")) ;
     }
 
   /* Close output file & socket */
@@ -1077,7 +1077,7 @@ void* monitor_aps(void *NULL_value)
         }
       sem_post(&lock_aps) ;
 
-      usleep(cfg_getint(cfg, "ap_check_interval") * 1000) ;
+      owl_msleep(cfg_getint(cfg, "ap_check_interval")) ;
     }
 
   pthread_exit(NULL_value) ;
diff --git a/owlps-client/owlps-client.c b/owlps-client/owlps-client.c
index 9fcd21c..cd55368 100644
--- a/owlps-client/owlps-client.c
+++ b/owlps-client/owlps-client.c
@@ -108,7 +108,7 @@ int main(int argc, char *argv[])
     {
       send_request() ;
       if (options.flood_delay >= 0 && owl_run)
-        usleep(options.flood_delay * 1000) ;
+        owl_msleep(options.flood_delay) ;
     }
 
   close(sockfd) ;