diff --git a/readability/scorers/smog.py b/readability/scorers/smog.py
index 8d9ef0a..11637ca 100644
--- a/readability/scorers/smog.py
+++ b/readability/scorers/smog.py
@@ -20,7 +20,7 @@ def __init__(self, stats, sentences, all_sentences=False):
         If all_sentences is false, computes the score as described in McLaughlin, 1969, using exactly 30 sentences
         If all_sentences is true, adjusts the score to use all sentences in the text
         """
-        if stats.num_sentences < 30:
+        if stats.num_sentences < 30 and not all_sentences:
             raise ReadabilityException(
                 'SMOG requires 30 sentences. {} found'
                 .format(stats.num_sentences))