diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index e282201..a602d92 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -92,6 +92,7 @@
 extern int  sysctl_dccp_feat_send_ack_vector;
 extern int  sysctl_dccp_feat_send_ndp_count;
 extern int  sysctl_dccp_tx_qlen;
+extern int  sysctl_dccp_sync_ratelimit;
 
 /*
  *	48-bit sequence number arithmetic (signed and unsigned)