diff --git a/timesearch/commentaugment.py b/timesearch/commentaugment.py
index 7191eb7..541141f 100644
--- a/timesearch/commentaugment.py
+++ b/timesearch/commentaugment.py
@@ -24,9 +24,8 @@ def commentaugment(
 
     common.r = common.bot.login(common.r)
     if specific_submission is not None:
-        if not specific_submission.startswith('t3_'):
-            specific_submission = 't3_' + specific_submission
-        specific_submission_obj = common.r.submission(specific_submission[3:])
+        specific_submission = common.t3_prefix(specific_submission)[3:]
+        specific_submission_obj = common.r.submission(specific_submission)
         subreddit = specific_submission_obj.subreddit.display_name
 
     if subreddit:
diff --git a/timesearch/common.py b/timesearch/common.py
index e8f5ed3..dbb5aaa 100644
--- a/timesearch/common.py
+++ b/timesearch/common.py
@@ -119,3 +119,8 @@ def split_any(text, delimiters):
     for replacer in replacers:
         text = text.replace(replacer, splitter)
     return text.split(splitter)
+
+def t3_prefix(submission_id):
+    if not submission_id.startswith('t3_'):
+        submission_id = 't3_' + submission_id
+    return submission_id