diff --git a/rv_debug b/rv_debug
new file mode 100644
index 00000000..ea1c3ef4
--- /dev/null
+++ b/rv_debug
@@ -0,0 +1,2 @@
+# debug
+dret      11..7=0 19..15=0 31..20=0x7b2 14..12=0 6..2=0x1C 1..0=3
diff --git a/rv_system b/rv_system
index f94c4cf7..24ab8fb1 100644
--- a/rv_system
+++ b/rv_system
@@ -1,5 +1,4 @@
 # SYSTEM
 mret      11..7=0 19..15=0 31..20=0x302 14..12=0 6..2=0x1C 1..0=3
-dret      11..7=0 19..15=0 31..20=0x7b2 14..12=0 6..2=0x1C 1..0=3
 wfi       11..7=0 19..15=0 31..20=0x105 14..12=0 6..2=0x1C 1..0=3