diff --git a/yaml/iss.yaml b/yaml/iss.yaml
index db2bf5ff..d1e41fc9 100644
--- a/yaml/iss.yaml
+++ b/yaml/iss.yaml
@@ -15,7 +15,7 @@
 - iss: spike
   path_var: SPIKE_PATH
   cmd: >
-    <path_var>/spike --log-commits --isa=<variant> --misaligned -l <elf>
+    <path_var>/spike --log-commits --isa=<variant> --priv=mu --misaligned -l <elf>
 
 - iss: ovpsim
   path_var: OVPSIM_PATH