diff --git a/pyLDAvis/_prepare.py b/pyLDAvis/_prepare.py
index d50c1881..30bee0a0 100644
--- a/pyLDAvis/_prepare.py
+++ b/pyLDAvis/_prepare.py
@@ -163,7 +163,7 @@ def js_TSNE(distributions, **kwargs):
     tsne : array, shape (`n_dists`, 2)
     """
     dist_matrix = squareform(pdist(distributions, metric=_jensen_shannon))
-    model = TSNE(n_components=2, random_state=0, metric='precomputed', **kwargs)
+    model = TSNE(n_components=2, random_state=0, metric='precomputed', perplexity=min(len(dist_matrix)-1, 30), **kwargs)
     return model.fit_transform(dist_matrix)
 
 
@@ -468,4 +468,4 @@ def to_dict(self):
                 'topic.order': self.topic_order}
 
     def to_json(self):
-        return json.dumps(self.to_dict(), cls=NumPyEncoder)
\ No newline at end of file
+        return json.dumps(self.to_dict(), cls=NumPyEncoder)