diff --git a/sims/common-sim-flags.mk b/sims/common-sim-flags.mk
index 30044508..2b56e989 100644
--- a/sims/common-sim-flags.mk
+++ b/sims/common-sim-flags.mk
@@ -37,10 +37,6 @@ SIM_LDFLAGS = \
 CLOCK_PERIOD ?= 1.0
 RESET_DELAY ?= 777.7
 
-VORTEX_SIM_PREPROC_DEFINES = \
-	+define+GPR_RESET \
-	+define+DBG_TRACE_CORE_PIPELINE_VCS
-
 SIM_PREPROC_DEFINES = \
 	+define+CLOCK_PERIOD=$(CLOCK_PERIOD) \
 	+define+RESET_DELAY=$(RESET_DELAY) \
@@ -51,5 +47,4 @@ SIM_PREPROC_DEFINES = \
 	+define+RANDOMIZE_REG_INIT \
 	+define+RANDOMIZE_GARBAGE_ASSIGN \
 	+define+RANDOMIZE_INVALID_ASSIGN \
-	$(VORTEX_SIM_PREPROC_DEFINES) \
 	$(EXTRA_SIM_PREPROC_DEFINES)