diff --git a/rop.rb b/rop.rb
index 6d24a40..aa16406 100644
--- a/rop.rb
+++ b/rop.rb
@@ -203,7 +203,7 @@ class RopCollect < RopBase
 
 			xtra = insn.bin_length
 
-			num.step(0, -1) do |x|
+			num.downto(0) do |x|
 				addr = ea - x
 
 				# get the disassembled instruction at this address