diff --git a/keras/layers/recurrent.py b/keras/layers/recurrent.py
index 5242516bae9d..e79c5b774e2a 100644
--- a/keras/layers/recurrent.py
+++ b/keras/layers/recurrent.py
@@ -953,7 +953,7 @@ class LSTM(Recurrent):
             the linear transformation of the recurrent state.
 
     # References
-        - [Long short-term memory](http://deeplearning.cs.cmu.edu/pdfs/Hochreiter97_lstm.pdf) (original 1997 paper)
+        - [Long short-term memory](http://www.bioinf.jku.at/publications/older/2604.pdf) (original 1997 paper)
         - [Learning to forget: Continual prediction with LSTM](http://www.mitpressjournals.org/doi/pdf/10.1162/089976600300015015)
         - [Supervised sequence labeling with recurrent neural networks](http://www.cs.toronto.edu/~graves/preprint.pdf)
         - [A Theoretically Grounded Application of Dropout in Recurrent Neural Networks](http://arxiv.org/abs/1512.05287)