diff --git a/test/functional/feature_maxuploadtarget.py b/test/functional/feature_maxuploadtarget.py
index b4e0df8a11..24f79dda67 100755
--- a/test/functional/feature_maxuploadtarget.py
+++ b/test/functional/feature_maxuploadtarget.py
@@ -36,7 +36,7 @@ class MaxUploadTest(BitcoinTestFramework):
         self.setup_clean_chain = True
         self.num_nodes = 1
         self.extra_args = [[
-            "-maxuploadtarget=800",
+            "-maxuploadtarget=800M",
             "-acceptnonstdtxn=1",
         ]]
         self.supports_cli = False