diff --git a/hex.s b/hex.s
index dc9c696..afdc82c 100644
--- a/hex.s
+++ b/hex.s
@@ -17,8 +17,8 @@ hexchars:
 #       none
 tohex:
     addi sp, sp, -20  # allocate stack space
-    sw s0, 12(sp)     # save contents of s0
-    sw s1, 8(sp)      # save contents of s1
+    sw s0, 16(sp)     # save contents of s0
+    sw s1, 12(sp)      # save contents of s1
     li s0, 0          # set up loop variables
     li s1, 4
     addi a1, a1, 6    # offset output address to end chars
@@ -35,8 +35,8 @@ tohex_loop:
     addi a1, a1, -2   # decrement output buffer address
     addi s0, s0, 1    # increment loop counter
     blt s0, s1, tohex_loop # TODO: we don't need the loop counter and output addr
-    lw s0, 12(sp)     # restore s0 & s1
-    lw s1, 8(sp)
+    lw s0, 16(sp)     # restore s0 & s1
+    lw s1, 12(sp)
     addi sp, sp, 20   # deallocate stack space
     ret