diff --git a/code/proof-of-work-example.py b/code/proof-of-work-example.py
index 0431fedfa..34ce873a0 100755
--- a/code/proof-of-work-example.py
+++ b/code/proof-of-work-example.py
@@ -37,7 +37,7 @@ def proof_of_work(header, difficulty_bits):
 
     # difficulty from 0 to 31 bits
     for difficulty_bits in xrange(32):
-        difficulty = 2 ** difficulty_bits
+        difficulty = 10 ** difficulty_bits
         print("Difficulty: %ld (%d bits)" % (difficulty, difficulty_bits))
         print("Starting search...")