diff --git a/bleu.py b/bleu.py
index f8f2b0a..dd01a14 100644
--- a/bleu.py
+++ b/bleu.py
@@ -20,6 +20,7 @@
 import sys, math, re, xml.sax.saxutils
 import subprocess
 import os
+import numpy as np
 
 # Added to bypass NIST-style pre-processing of hyp and ref files -- wade
 nonorm = 0
@@ -186,7 +187,7 @@ def bleuFromMaps(m1, m2):
   for key in m1:
     if key in m2:
       bl = bleu(m1[key], m2[key][0])
-      score = [ score[i] + bl[i] for i in range(0, len(bl))]
+      score = np.add(score,bl)
       num += 1
   return [s * 100.0 / num for s in score]
 
diff --git a/experiment/bleu.py b/experiment/bleu.py
index f8f2b0a..dd01a14 100644
--- a/experiment/bleu.py
+++ b/experiment/bleu.py
@@ -20,6 +20,7 @@
 import sys, math, re, xml.sax.saxutils
 import subprocess
 import os
+import numpy as np
 
 # Added to bypass NIST-style pre-processing of hyp and ref files -- wade
 nonorm = 0
@@ -186,7 +187,7 @@ def bleuFromMaps(m1, m2):
   for key in m1:
     if key in m2:
       bl = bleu(m1[key], m2[key][0])
-      score = [ score[i] + bl[i] for i in range(0, len(bl))]
+      score = np.add(score,bl)
       num += 1
   return [s * 100.0 / num for s in score]
 
diff --git a/experiment/code-to-text/code/bleu.py b/experiment/code-to-text/code/bleu.py
index f8f2b0a..f737451 100644
--- a/experiment/code-to-text/code/bleu.py
+++ b/experiment/code-to-text/code/bleu.py
@@ -20,7 +20,7 @@
 import sys, math, re, xml.sax.saxutils
 import subprocess
 import os
-
+import numpy as np
 # Added to bypass NIST-style pre-processing of hyp and ref files -- wade
 nonorm = 0
 
@@ -186,7 +186,7 @@ def bleuFromMaps(m1, m2):
   for key in m1:
     if key in m2:
       bl = bleu(m1[key], m2[key][0])
-      score = [ score[i] + bl[i] for i in range(0, len(bl))]
+      score = np.add(score,bl)
       num += 1
   return [s * 100.0 / num for s in score]
 
diff --git a/experiment/code-to-text/evaluator/evaluator.py b/experiment/code-to-text/evaluator/evaluator.py
index f8f2b0a..dd01a14 100644
--- a/experiment/code-to-text/evaluator/evaluator.py
+++ b/experiment/code-to-text/evaluator/evaluator.py
@@ -20,6 +20,7 @@
 import sys, math, re, xml.sax.saxutils
 import subprocess
 import os
+import numpy as np
 
 # Added to bypass NIST-style pre-processing of hyp and ref files -- wade
 nonorm = 0
@@ -186,7 +187,7 @@ def bleuFromMaps(m1, m2):
   for key in m1:
     if key in m2:
       bl = bleu(m1[key], m2[key][0])
-      score = [ score[i] + bl[i] for i in range(0, len(bl))]
+      score = np.add(score,bl)
       num += 1
   return [s * 100.0 / num for s in score]