diff --git a/build.py b/build.py
index 214775dd7..ac3c489e3 100644
--- a/build.py
+++ b/build.py
@@ -65,7 +65,7 @@ elif install_mode == 'test':
         os.chdir('tmp')
 
         x('python -m spacy.en.download')
-        x('python -m pytest ../spacy/ -x --models --vectors --slow')
+        x('python -m pytest --tb="native" ../spacy/ -x --models --vectors --slow')
 
     finally:
         os.chdir(old)