diff --git a/tests/run-tests.py b/tests/run-tests.py
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -2318,13 +2318,13 @@
 
     if previoustimes:
         def sortkey(f):
-          f = f['path']
-          if f in previoustimes:
-            # Use most recent time as estimate
-            return -previoustimes[f][-1]
-          else:
-            # Default to a rather arbitrary value of 1 second for new tests
-            return -1.0
+            f = f['path']
+            if f in previoustimes:
+                # Use most recent time as estimate
+                return -previoustimes[f][-1]
+            else:
+                # Default to a rather arbitrary value of 1 second for new tests
+                return -1.0
     else:
         # keywords for slow tests
         slow = {b'svn': 10,
@@ -2447,7 +2447,7 @@
                 self._outputdir = os.path.join(self._outputdir, pathname)
         previoustimes = {}
         if self.options.order_by_runtime:
-          previoustimes = dict(loadtimes(self._outputdir))
+            previoustimes = dict(loadtimes(self._outputdir))
         sorttests(testdescs, previoustimes, shuffle=self.options.random)
 
         if 'PYTHONHASHSEED' not in os.environ: