diff --git a/bin/sassw b/bin/sassw
index 56ecdef..e580f02 100755
--- a/bin/sassw
+++ b/bin/sassw
@@ -29,8 +29,7 @@ class EventManager(pyinotify.ProcessEvent):
             print(f'{filename} changed, building', end='')
             t0 = time.time()
             build()
-            elapsed_time = time.time() - t0
-            print(' (%.2fs)' % (time.time() - t0))
+            print(f' ({time.time() - t0:.2f}s)')
 
 build()
 wm = pyinotify.WatchManager()