diff --git a/CHANGES.txt b/CHANGES.txt
index e738a63..bd9175a 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,7 @@
+## Version 3.4.1 du 10/02/2016-11:45
+
+a702b89 mergecsv: bug quand left ne contient qu'un seul champ vide
+
 ## Version 3.4.0 du 09/02/2016-11:25
 
 788e1ff cgilsxml.py: ajout de l'option -E. bug avec le tri sur des valeurs inexistantes
diff --git a/VERSION.txt b/VERSION.txt
index 1809198..47b322c 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-3.4.0
+3.4.1
diff --git a/lib/ulib/awk b/lib/ulib/awk
index 15bb948..63afe19 100644
--- a/lib/ulib/awk
+++ b/lib/ulib/awk
@@ -1448,8 +1448,8 @@ function printmerged(lline, rline, nocopy,        linecsv, tmplinecsv) {
   }
   linecsv = array_formatcsv(lfields)
   tmplinecsv = array_formatcsv(rfields)
-  if (tmplinecsv != "") {
-    if (linecsv != "") linecsv = linecsv ","
+  if (array_len(rfields) > 0) {
+    if (array_len(lfields) > 0) linecsv = linecsv ","
     linecsv = linecsv tmplinecsv
   }
   print linecsv