diff --git a/lib/src/upper/rlc_um.cc b/lib/src/upper/rlc_um.cc
index 50835089a..b1b2d91be 100644
--- a/lib/src/upper/rlc_um.cc
+++ b/lib/src/upper/rlc_um.cc
@@ -31,7 +31,7 @@
 
 namespace srslte {
 
-rlc_um::rlc_um() : tx_sdu_queue(16)
+rlc_um::rlc_um() : tx_sdu_queue(32)
 {
   log = NULL;
   pdcp = NULL;