diff --git a/srsue/src/stack/mac_nr/mux_nr.cc b/srsue/src/stack/mac_nr/mux_nr.cc
index 78dc7b090..38d456619 100644
--- a/srsue/src/stack/mac_nr/mux_nr.cc
+++ b/srsue/src/stack/mac_nr/mux_nr.cc
@@ -76,7 +76,7 @@ srsran::unique_byte_buffer_t mux_nr::get_pdu(uint32_t max_pdu_len)
   // Pack normal UL data PDU
   int32_t remaining_len = tx_pdu.get_remaing_len(); // local variable to reserve space for CEs
 
-  if (add_bsr_ce == sbsr_ce) {
+  if (!msg3_is_pending() && add_bsr_ce == sbsr_ce) {
     // reserve space for SBSR
     remaining_len -= 2;
   }