diff --git a/scripts/test_runner.py b/scripts/test_runner.py
index 5941830..f603d40 100755
--- a/scripts/test_runner.py
+++ b/scripts/test_runner.py
@@ -2,6 +2,7 @@
 """Runs test within Qemu and Renode simulators."""
 import argparse
 import os
+import re
 import sys
 import tempfile
 
@@ -120,6 +121,10 @@
     simulator_class = Simulators[args.simulator]
     simulator = simulator_class(simulator_path, args.elf)
     output = simulator.run(timeout=args.timeout)
+    # mono API generates escape characters at the termination. Need to clean up.
+    # TODO(hcindyl): Remove this when Renode fix the mono call.
+    ansi_escape = re.compile(r"\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])")
+    output = ansi_escape.sub("", output)
     print(output)
     failure_strings = ["FAILED", "Exception occurred"]
     if any(x in output for x in failure_strings):