1 files changed, 6 insertions, 1 deletions

diff --git a/plugins/check_ping.c b/plugins/check_ping.c
index 6b56660..a6c43c3 100644
--- a/plugins/check_ping.c
+++ b/plugins/check_ping.c
@@ -50,7 +50,7 @@ int cpl = UNKNOWN_PACKET_LOSS;
 float wrta = UNKNOWN_TRIP_TIME;
 float crta = UNKNOWN_TRIP_TIME;
 char **addresses = NULL;
-int n_addresses;
+int n_addresses = 0;
 int max_addr = 1;
 int max_packets = -1;
 int verbose = 0;
@@ -392,6 +392,11 @@ validate_arguments ()
                         usage2 (_("Invalid hostname/address"), addresses[i]);
         }
 
+        if (n_addresses == 0) {
+                printf(_("You must specify a server address or host name\n"));
+                return ERROR;
+        }
+
         return OK;
 }