diff --git a/ago.py b/ago.py
index b3d9760..8816d18 100644
--- a/ago.py
+++ b/ago.py
@@ -20,11 +20,8 @@ def get_delta_from_subject(subject):
 
         dt = datetime.fromtimestamp(subject)
 
-    # strip timezone data
-    dt = dt.replace(tzinfo=None)
-
-    # finally, return a timedelta from the datetime
-    return datetime.now() - dt
+    # return a timedelta from the datetime, using its timezone (if it has one)
+    return datetime.now(tz=dt.tzinfo) - dt
 
 
 def delta2dict(delta):