diff --git a/ago.py b/ago.py
index de4dbb1..7efe64c 100644
--- a/ago.py
+++ b/ago.py
@@ -25,11 +25,14 @@ def human(dt, precision=2, past_tense='{} ago', future_tense='in {}'):
 
     d = delta2dict( delta )
     hlist = [] 
+    count = 0
     units = ( 'year', 'day', 'hour', 'minute', 'second', 'microsecond' )
-    for unit in units[:precision]: # strip units to precision
+    for unit in units:
+        if count >= precision: break # met precision
         if d[ unit ] == 0: continue # skip 0's
         s = '' if d[ unit ] == 1 else 's' # handle plurals
         hlist.append( '%s %s%s' % ( d[unit], unit, s ) )
+        count += 1
     human_delta = ', '.join( hlist )
     return the_tense.format(human_delta)