diff --git a/GNUmakefile b/GNUmakefile
index fcbbbb4d8..09ad52b25 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -61,9 +61,9 @@ Z_FEATURE_INTEREST?=1
 Z_FEATURE_RAWETH_TRANSPORT?=0
 
 # Buffer sizes
-FRAG_MAX_SIZE?=300000
-BATCH_UNICAST_SIZE?=65535
-BATCH_MULTICAST_SIZE?=8096
+FRAG_MAX_SIZE?=4096
+BATCH_UNICAST_SIZE?=2048
+BATCH_MULTICAST_SIZE?=2048
 
 # zenoh-pico/ directory
 ROOT_DIR:=$(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))