diff --git a/bin/wsim b/bin/wsim
index c5119398f..73afed730 100755
--- a/bin/wsim
+++ b/bin/wsim
@@ -89,6 +89,8 @@ def prepSim(args, ElfFile):
     defineList = []
     if args.vcd:
         paramsList.append("MAKE_VCD=1")
+        if args.sim == "questa":
+            flagsList.append("--vcd")
     if args.rvvi:
         paramsList.append("RVVI_SYNTH_SUPPORTED=1")
     if args.tb == "testbench_fp":
diff --git a/sim/questa/wally.do b/sim/questa/wally.do
index 8d5174d55..22f78b91b 100644
--- a/sim/questa/wally.do
+++ b/sim/questa/wally.do
@@ -96,12 +96,18 @@ while {$argc > 0} {
 
 echo "lst = $lst"
 
-# if +acc found set flag and remove from list
+# if --gui found set flag and remove from list
 if {[lcheck lst "--gui"]} {
     set GUI 1
     set accFlag "+acc"
 }
 
+# if --vcd found set flag and remove from list
+if {[lcheck lst "--vcd"]} {
+    set VCD 1
+    set accFlag "+acc"
+}
+
 # if --ccov found set flag and remove from list
 if {[lcheck lst "--ccov"]} {
     set ccov 1