diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -35,7 +35,7 @@
     during fee calculation, or due to the wallet funding transactions using the
     ceiling of the calculated fee.
     """
-    target_fee = tx_size * fee_per_kB / 1000
+    target_fee = round(tx_size * fee_per_kB / 1000, 8)
     if fee < (tx_size - wiggleroom) * fee_per_kB / 1000:
         raise AssertionError(
             "Fee of {} BCH too low! (Should be {} BCH)".format(str(fee), str(target_fee)))