diff --git a/dos/str/strrev.k b/dos/str/strrev.k
index 1338af2..2f1b2f1 100644
--- a/dos/str/strrev.k
+++ b/dos/str/strrev.k
@@ -11,8 +11,7 @@ strrev:
 
     ; save str's location
     ; xxx why is dec'ing needed?
-    ;lea rdx, b[ax1 + -1]
-    mov rdx, ax1
+    lea rdx, b[ax1 + -1]
 
     ; go to str's end, just before
     ; the null terminator
@@ -36,7 +35,7 @@ strrev:
     jmp .2
 
 .3:
-    mov b[ax0+2], 0
+    mov b[ax0+1], 0
 
 .4:
     ret