diff --git a/targets/SIMU/USER/Makefile b/targets/SIMU/USER/Makefile
index cfc2345d6c..88395667d4 100644
--- a/targets/SIMU/USER/Makefile
+++ b/targets/SIMU/USER/Makefile
@@ -132,6 +132,10 @@ CFLAGS += -DRel8
 #endif
 endif
 
+ifeq ($(RLC_STOP_ON_LOST_PDU), 1)
+CFLAGS += -DRLC_STOP_ON_LOST_PDU
+endif
+
 ifeq ($(ENABLE_RAL), 1)
 CFLAGS += -DENABLE_RAL
 endif