diff --git a/owlps-aggregator/owlps-aggregatord.c b/owlps-aggregator/owlps-aggregatord.c
index 98a12b2..7047e3f 100644
--- a/owlps-aggregator/owlps-aggregatord.c
+++ b/owlps-aggregator/owlps-aggregatord.c
@@ -605,7 +605,7 @@ void* monitor_requests(void *NULL_value)
                   request_info_ptr = request_ptr->info ;
                   while (request_info_ptr != NULL)
                     {
-                      request.nb_info++;
+                      ++request.nb_info ;
                       request_info_ptr = request_info_ptr->next ;
                     }
                   // Endianess conversions:
diff --git a/owlps-client/owlps-client.c b/owlps-client/owlps-client.c
index 173830b..2fc95d0 100644
--- a/owlps-client/owlps-client.c
+++ b/owlps-client/owlps-client.c
@@ -157,7 +157,7 @@ void parse_main_options(int argc, char **argv)
                   // Take the optind value:
                   options.flood_delay =
                     strtoul(argv[optind], NULL, 0) ;
-                  optind++ ;
+                  ++optind ;
                 }
             }
           break ;
@@ -185,7 +185,7 @@ void parse_main_options(int argc, char **argv)
                   // Take the optind value:
                   options.listening_port =
                     strtoul(argv[optind], NULL, 0) ;
-                  optind++ ;
+                  ++optind ;
                 }
             }
           break ;
diff --git a/owlps-listener/owlps-listenerd.c b/owlps-listener/owlps-listenerd.c
index a5f8dd4..56e0033 100644
--- a/owlps-listener/owlps-listenerd.c
+++ b/owlps-listener/owlps-listenerd.c
@@ -1058,13 +1058,13 @@ void extract_radiotap_data(const u_char *packet,
   // The Radiotap header is little-endian
   rtap_presentflags = le32toh(rtap_presentflags) ;
 
-  for (i = 0 ; i < 15 ; i++) // Initialise present flags structure
+  for (i = 0 ; i < 15 ; ++i) // Initialise present flags structure
     rtap_fields[i] = FALSE ;
   rtap_position = 8 ; // Begining of the present flags determined fields
 
   // Test the first 15 bits of the flag field in order to check their
   // presence and to copy them:
-  for (i = 0 ; i < 15 ; i++)
+  for (i = 0 ; i < 15 ; ++i)
     {
       if ((rtap_presentflags % 2) == 1)
         {