diff --git a/tools/extras/install_rnnlm_hs.sh b/tools/extras/install_rnnlm_hs.sh
index 7fac7fa07..40173a362 100755
--- a/tools/extras/install_rnnlm_hs.sh
+++ b/tools/extras/install_rnnlm_hs.sh
@@ -11,4 +11,7 @@ fi
 echo "Installing RNNLM-HS 0.1b"
 
 cd rnnlm-hs-0.1b
+if  grep -q '#define MAX_STRING 100' rnnlm.c ; then 
+    patch <../extras/rnnlm.patch
+fi
 make
diff --git a/tools/extras/rnnlm.patch b/tools/extras/rnnlm.patch
new file mode 100644
index 000000000..97b02571f
--- /dev/null
+++ b/tools/extras/rnnlm.patch
@@ -0,0 +1,13 @@
+Index: rnnlm.c
+===================================================================
+--- rnnlm.c	(revision 4774)
++++ rnnlm.c	(working copy)
+@@ -20,7 +20,7 @@
+ #include <pthread.h>
+ #include <assert.h>
+ 
+-#define MAX_STRING 100
++#define MAX_STRING 256
+ #define MAX_SENTENCE_LENGTH 10000
+ #define MAX_CODE_LENGTH 40
+