diff --git a/samples/bluetooth/mesh/dfu/distributor/prj.conf b/samples/bluetooth/mesh/dfu/distributor/prj.conf
index e47c1fc03a4a..ec2648184543 100644
--- a/samples/bluetooth/mesh/dfu/distributor/prj.conf
+++ b/samples/bluetooth/mesh/dfu/distributor/prj.conf
@@ -56,6 +56,7 @@ CONFIG_BT_MESH_SHELL=y
 CONFIG_BT_MESH_DK_PROV=y
 CONFIG_BT_MESH_PROXY_USE_DEVICE_NAME=y
 CONFIG_BT_MESH_MODEL_EXTENSIONS=y
+CONFIG_BT_MESH_MODEL_EXTENSION_LIST_SIZE=3
 
 # Bluetooth Mesh models
 CONFIG_BT_MESH_BLOB_SRV=y
diff --git a/samples/bluetooth/mesh/dfu/target/prj.conf b/samples/bluetooth/mesh/dfu/target/prj.conf
index 1a4122731dc3..4aa720c8d9fb 100644
--- a/samples/bluetooth/mesh/dfu/target/prj.conf
+++ b/samples/bluetooth/mesh/dfu/target/prj.conf
@@ -57,6 +57,7 @@ CONFIG_BT_MESH_GATT_PROXY=y
 CONFIG_BT_MESH_DK_PROV=y
 CONFIG_BT_MESH_PROXY_USE_DEVICE_NAME=y
 CONFIG_BT_MESH_MODEL_EXTENSIONS=y
+CONFIG_BT_MESH_MODEL_EXTENSION_LIST_SIZE=1
 
 # Bluetooth Mesh models
 CONFIG_BT_MESH_BLOB_SRV=y