diff --git a/bin/regression-wally b/bin/regression-wally
index be2e77480..88b88a000 100755
--- a/bin/regression-wally
+++ b/bin/regression-wally
@@ -455,7 +455,7 @@ def selectTests(args, sims, coverStr):
         addTestsByDir(f"{WALLY}/tests/riscof/work/wally-riscv-arch-test/rv64i_m/privilege", "rv64gc", coveragesim, coverStr, configs)
         # addTestsByDir(f"{WALLY}/tests/riscof/work/riscv-arch-test/rv64i_m/F", "rv64gc", coveragesim, coverStr, configs) # doesn't help fdivsqrt coverage 4/3/2025
     # run tests in lockstep in functional coverage mode
-    if args.fcov:
+    if args.fcov or args.nightly:
         addTestsByDir(f"{archVerifDir}/tests/rv32/", "rv32gc", coveragesim, coverStr, configs, lockstepMode=1)
         addTestsByDir(f"{archVerifDir}/tests/rv64/", "rv64gc", coveragesim, coverStr, configs, lockstepMode=1)
         addTestsByDir(f"{archVerifDir}/tests/priv/rv32/", "rv32gc", coveragesim, coverStr, configs, lockstepMode=1)