diff --git a/juriscraper/lib/test_utils.py b/juriscraper/lib/test_utils.py
index 5d654b894..da01ac712 100644
--- a/juriscraper/lib/test_utils.py
+++ b/juriscraper/lib/test_utils.py
@@ -64,7 +64,7 @@ def warn_or_crash_slow_parser(duration, warn_duration=1, max_duration=15):
             # Only do this if we're not debugging. Debuggers make things slower
             # and breakpoints make things stop.
             raise SlownessException(
-                "This scraper took {duration}s to test, which is more than "
+                "This scraper took {duration:.3f}s to test, which is more than "
                 "the allowed speed of {max_duration}s. Please speed it up for "
                 "tests to pass.".format(
                     duration=duration, max_duration=max_duration