diff --git a/src/killall.c b/src/killall.c
index 8b590c2..2550fc1 100644
--- a/src/killall.c
+++ b/src/killall.c
@@ -331,7 +331,7 @@ kill_all (int signal, int names, char **namelist, struct passwd *pwent)
     pgids = NULL;		/* silence gcc */
   else
     {
-      pgids = malloc (pids * sizeof (pid_t));
+      pgids = calloc (pids, sizeof (pid_t));
       if (!pgids)
 	{
 	  perror ("malloc");