diff --git a/tests/performance/api/environment.py b/tests/performance/api/environment.py
index 094dbfa67ed..38f2a80922f 100644
--- a/tests/performance/api/environment.py
+++ b/tests/performance/api/environment.py
@@ -175,7 +175,7 @@ class TestEnvironment:
         if self.log_file:
             if not self.log_file.exists():
                 self.log_file.parent.mkdir(parents=True, exist_ok=True)
-            f = open(self.log_file, 'a')
+            f = open(self.log_file, 'a', encoding='utf-8', errors='ignore')
             f.write('\n' + ' '.join([str(arg) for arg in args]) + '\n\n')
 
         env = os.environ