diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 07dcbe7..3af3320 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -72,7 +72,14 @@
 /* RFC 1122, 4.2.3.1 initial RTO value */
 #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
 
-#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
+/*
+ * The maximum back-off value for retransmissions. This is needed for
+ *  - retransmitting client-Requests (sec. 8.1.1),
+ *  - retransmitting Close/CloseReq when closing (sec. 8.3),
+ *  - feature-negotiation retransmission (sec. 6.6.3),
+ *  - Acks in client-PARTOPEN state (sec. 8.1.5).
+ */
+#define DCCP_RTO_MAX ((unsigned)(64 * HZ))
 
 /*
  * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4