diff --git a/core/net/ipv6/sicslowpan.c b/core/net/ipv6/sicslowpan.c
index e69bdd88b..44a75fb96 100644
--- a/core/net/ipv6/sicslowpan.c
+++ b/core/net/ipv6/sicslowpan.c
@@ -1705,7 +1705,7 @@ input(void)
 
       sicslowpan_len = frag_size;
       reass_tag = frag_tag;
-      timer_set(&reass_timer, SICSLOWPAN_REASS_MAXAGE * CLOCK_SECOND / 16);
+      timer_set(&reass_timer, SICSLOWPAN_REASS_MAXAGE * CLOCK_SECOND);
       PRINTFI("sicslowpan input: INIT FRAGMENTATION (len %d, tag %d)\n",
              sicslowpan_len, reass_tag);
       linkaddr_copy(&frag_sender, packetbuf_addr(PACKETBUF_ADDR_SENDER));