diff --git a/scripts/concatW2V.py b/scripts/concatW2V.py
index 024459e032f090b5006bc585bfb22a90f3c89bce..8100d988d95e2fd9e84535d735e0d827aaa72df1 100755
--- a/scripts/concatW2V.py
+++ b/scripts/concatW2V.py
@@ -2,17 +2,27 @@
 
 import sys
 
-hadFirst = False
+nbLines = 0
+embSize = None
 for filename in sys.argv[1:] :
-  prefix = filename.split('/')[-1].split('.')[0]
   for line in open(filename, "r") :
     line = line.strip()
     splited = line.split()
     if len(splited) == 2 :
-      if hadFirst :
-        continue
-      hadFirst = True
-      print(line)
+      if embSize is None :
+        embSize = int(splited[1])
+      elif embSize != int(splited[1]) :
+        print("ERROR : incompatibles embedings sizes %d and %d"%(embSize, int(splited[1])), file=sys.stderr)
+        exit(1)
     else :
+      nbLines += 1
+
+print(nbLines, embSize)
+for filename in sys.argv[1:] :
+  prefix = filename.split('/')[-1].split('.')[0]
+  for line in open(filename, "r") :
+    line = line.strip()
+    splited = line.split()
+    if len(splited) > 2 :
       print(prefix+"_"+line)