diff --git a/test/functional/test_framework/test_node.py b/test/functional/test_framework/test_node.py
index 287dc0e53..50942aec4 100755
--- a/test/functional/test_framework/test_node.py
+++ b/test/functional/test_framework/test_node.py
@@ -351,8 +351,7 @@ class TestNodeCLI():
 
     def send_cli(self, command=None, *args, **kwargs):
         """Run bitcoin-cli command. Deserializes returned string as python object."""
-
-        pos_args = [str(arg) for arg in args]
+        pos_args = [str(arg).lower() if type(arg) is bool else str(arg) for arg in args]
         named_args = [str(key) + "=" + str(value) for (key, value) in kwargs.items()]
         assert not (pos_args and named_args), "Cannot use positional arguments and named arguments in the same bitcoin-cli call"
         p_args = [self.binary, "-datadir=" + self.datadir] + self.options