diff --git a/htdocs/core/class/translate.class.php b/htdocs/core/class/translate.class.php
index 184724c0319..6bfe5cdc195 100644
--- a/htdocs/core/class/translate.class.php
+++ b/htdocs/core/class/translate.class.php
@@ -113,7 +113,7 @@ class Translate
 			} else $srclang = strtolower($langpart[0])."_".strtoupper($langpart[0]);
 		} else {						// If it's for a codetouse that is a short code xx
     	    // Array to convert short lang code into long code.
-	        $longforshort = array('ar'=>'ar_SA', 'el'=>'el_GR', 'ca'=>'ca_ES', 'en'=>'en_US', 'nb'=>'nb_NO', 'no'=>'nb_NO');
+	        $longforshort = array('ar'=>'ar_SA', 'el'=>'el_GR', 'ca'=>'ca_ES', 'en'=>'en_US', 'ja'=>'ja_JP', 'nb'=>'nb_NO', 'no'=>'nb_NO');
 			if (isset($longforshort[strtolower($langpart[0])])) $srclang = $longforshort[strtolower($langpart[0])];
 			elseif (!empty($langpart[0])) $srclang = strtolower($langpart[0])."_".strtoupper($langpart[0]);
 			else $srclang = 'en_US';