diff --git a/trunner/types.py b/trunner/types.py
index 469109e8..67b71e3c 100644
--- a/trunner/types.py
+++ b/trunner/types.py
@@ -242,10 +242,12 @@ def _failed_traceback(self) -> List[str]:
         return [bold("ASSERTION TRACEBACK (most recent call last):"), "".join(tb_info)]
 
     def _failed_before_buffer(self, dut) -> str:
-        return dut.before.replace("\r", "")
+        before = re.sub(r'\x1b\[[0-9]*[A-Za-z]', '', dut.before)
+        return before.replace("\r", "")
 
     def _failed_buffer(self, dut) -> str:
-        return dut.buffer.replace("\r", "")
+        buffer = re.sub(r'\x1b\[[0-9]*[A-Zaq-z]', '', dut.buffer)
+        return buffer.replace("\r", "")
 
     def fail_pexpect(self, dut, exc):
         self.fail(summary="Pexpect failure")