diff --git a/test_ago.py b/test_ago.py
index 865b5cf..c087ee7 100644
--- a/test_ago.py
+++ b/test_ago.py
@@ -10,7 +10,7 @@ PAST    = PRESENT - timedelta( 492, 58711, 45 ) # days, secs, ms
 FUTURE  = PRESENT + timedelta( 2, 12447, 963 ) # days, secs, ms
 
 PAST_DELTA   = PRESENT - PAST
-FUTURE_DELTA = FUTURE - PRESENT 
+FUTURE_DELTA = PRESENT - FUTURE
 
 def test_human_is_string():
     assert 'str' in str(type(human( PAST )))