diff --git a/nmrpd.h b/nmrpd.h
index 924323b..c40ddaf 100644
--- a/nmrpd.h
+++ b/nmrpd.h
@@ -85,6 +85,7 @@
 #define NMRP_DEFAULT_TFTP_PORT       69
 
 #define NMRP_ETH_TIMEOUT_S           60
+#define NMRP_MAX_UL_REQS             3
 
 struct eth_hdr {
 	uint8_t ether_dhost[6];