diff --git a/contrib/interconnect/udp/ic_udpifc.c b/contrib/interconnect/udp/ic_udpifc.c
index d11e4577cd6..8bce8a7cf29 100644
--- a/contrib/interconnect/udp/ic_udpifc.c
+++ b/contrib/interconnect/udp/ic_udpifc.c
@@ -3753,7 +3753,7 @@ SetupUDPIFCInterconnect(EState *estate)
 			Gp_interconnect_queue_depth == 4 &&
 			Gp_interconnect_snd_queue_depth == 2)
 		{
-			int32 perQueue = Gp_interconnect_mem_size /
+			int32 perQueue = ((int64)Gp_interconnect_mem_size * 1024 * 1024) /
 				(Gp_max_packet_size * sliceNum);
 
 			calcSndDepth = Max(Gp_interconnect_snd_queue_depth, perQueue / 2);
diff --git a/contrib/udp2/ic_udp2.c b/contrib/udp2/ic_udp2.c
index 0972c874941..fb9cafc8813 100644
--- a/contrib/udp2/ic_udp2.c
+++ b/contrib/udp2/ic_udp2.c
@@ -179,7 +179,7 @@ SetupInterconnectUDP2(EState *estate)
 		Gp_interconnect_queue_depth == 4 &&
 		Gp_interconnect_snd_queue_depth == 2)
 	{
-		int32 perQueue = Gp_interconnect_mem_size /
+		int32 perQueue = ((int64)Gp_interconnect_mem_size * 1024 * 1024) /
 			(Gp_max_packet_size * sliceNum);
 
 		calcSndDepth = Max(Gp_interconnect_snd_queue_depth, perQueue / 2);