diff --git a/test/functional/blockchain.py b/test/functional/blockchain.py
index c0ebad6912..8dc500e6ca 100755
--- a/test/functional/blockchain.py
+++ b/test/functional/blockchain.py
@@ -47,9 +47,9 @@ class BlockchainTest(BitcoinTestFramework):
         chaintxstats = self.nodes[0].getchaintxstats(1)
         # 200 txs plus genesis tx
         assert_equal(chaintxstats['txcount'], 201)
-        # tx rate should be 1 per 10 minutes, or 1/600
+        # tx rate should be 1 per ~2.6 minutes (156 seconds), or 1/156
         # we have to round because of binary math
-        assert_equal(round(chaintxstats['txrate'] * 600, 10), Decimal(1))
+        assert_equal(round(chaintxstats['txrate'] * 156, 10), Decimal(1))
 
     def _test_gettxoutsetinfo(self):
         node = self.nodes[0]