diff --git a/test/functional/p2p_sendheaders.py b/test/functional/p2p_sendheaders.py
--- a/test/functional/p2p_sendheaders.py
+++ b/test/functional/p2p_sendheaders.py
@@ -523,7 +523,7 @@
 
         # Now announce a header that forks the last two blocks
         tip = blocks[0].sha256
-        height -= 1
+        height -= 2
         blocks = []
 
         # Create extra blocks for later