diff --git a/ChangeLog b/ChangeLog
index c042efef0037a85599be9a36b0a84025ef1b4150..e47d53211c708ce7d83acb12fcbc976562abb2ea 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,7 @@ English Dolibarr ChangeLog
 
 ***** ChangeLog for 3.5.5 compared to 3.5.4 *****
 Fix: [ bug #1523 ] suite bug #1334 : filtre et ordre de tri conjoints ne s'appliquent pas.
+Fix: Fusion PDF button on unpaid invoice is no more displayed 
 
 ***** ChangeLog for 3.5.4 compared to 3.5.3 *****
 Fix: Hide title of event when agenda module disabled.
diff --git a/htdocs/core/class/html.formfile.class.php b/htdocs/core/class/html.formfile.class.php
index d2cba220bcf1942bb4234c8504061c515bd34374..24365c6199a0b5eb882bd71befc8db1139e11c3b 100644
--- a/htdocs/core/class/html.formfile.class.php
+++ b/htdocs/core/class/html.formfile.class.php
@@ -509,7 +509,7 @@ class FormFile
                	$genbutton.= ' '.img_warning($langs->transnoentitiesnoconv("WarningNoDocumentModelActivated"));
             }
             if (! $allowgenifempty && ! is_array($modellist) && empty($modellist) && empty($conf->dol_no_mouse_hover) && $modulepart != 'unpaid') $genbutton='';
-            if (empty($modellist) && ! $showempty) $genbutton='';
+            if (empty($modellist) && ! $showempty && $modulepart != 'unpaid') $genbutton='';
             $out.= $genbutton;
             $out.= '</th>';