diff --git a/lldb/packages/Python/lldbsuite/test/lldbtest.py b/lldb/packages/Python/lldbsuite/test/lldbtest.py
index 2309b403cb99..69da3914f1f2 100644
--- a/lldb/packages/Python/lldbsuite/test/lldbtest.py
+++ b/lldb/packages/Python/lldbsuite/test/lldbtest.py
@@ -516,7 +516,7 @@ def system(commands, **kwargs):
                 "command": shellCommand
             }
             raise cpe
-        output = output + this_output.decode("utf-8")
+        output = output + this_output.decode("utf-8", errors='ignore')
     return output