--- libnet/src/libnet_cq.c
+++ libnet/src/libnet_cq.c
@@ -113,8 +113,8 @@ libnet_cq_add(libnet_t *l, char *label)
         l_cq->context = l;
 
         /* label the context with the user specified string */
-        strncpy(l->label, label, LIBNET_LABEL_SIZE);
-        l->label[LIBNET_LABEL_SIZE] = '\0';
+        l->label[0] = '\0';
+        strncat(l->label, label, LIBNET_LABEL_SIZE - 1);
 
         l_cq->next = NULL;
         l_cq->prev = NULL;
@@ -144,8 +144,8 @@ libnet_cq_add(libnet_t *l, char *label)
     new->context = l;
 
     /* label the context with the user specified string */
-    strncpy(l->label, label, LIBNET_LABEL_SIZE);
-    l->label[LIBNET_LABEL_SIZE] = '\0';
+    l->label[0] = '\0';
+    strncat(l->label, label, LIBNET_LABEL_SIZE - 1);
 
     new->next = l_cq;
     new->prev = NULL;
--- libnet/src/libnet_init.c
+++ libnet/src/libnet_init.c
@@ -76,8 +76,8 @@ libnet_init(int injection_type, char *device, char *err_buf)
     l->ptag_state       = LIBNET_PTAG_INITIALIZER;
     l->device           = (device ? strdup(device) : NULL);
 
-    strncpy(l->label, LIBNET_LABEL_DEFAULT, LIBNET_LABEL_SIZE);
-    l->label[sizeof(l->label)] = '\0';
+    l->label[0] = '\0';
+    strncat(l->label, LIBNET_LABEL_DEFAULT, LIBNET_LABEL_SIZE - 1);
 
     switch (l->injection_type)
     {