diff --git a/koha-tmpl/intranet-tmpl/default/en/acqui.simple/addbiblio.tmpl b/koha-tmpl/intranet-tmpl/default/en/acqui.simple/addbiblio.tmpl
index 7a3841d501..18ff5f845a 100644
--- a/koha-tmpl/intranet-tmpl/default/en/acqui.simple/addbiblio.tmpl
+++ b/koha-tmpl/intranet-tmpl/default/en/acqui.simple/addbiblio.tmpl
@@ -512,7 +512,7 @@ function PopupZ3950() {
 		    strQuery += "&issn="+document.forms[0].field_value[i].value;
 		}
 	}
-	newin=window.open("../z3950/search.pl?bibid=<!-- TMPL_VAR NAME="bibid" -->"+strQuery,"z3950search",'width=500,height=400,toolbar=false,scrollbars=yes');
+	newin=window.open("../z3950/search.pl?bibid=<!-- TMPL_VAR NAME="bibid" -->"+strQuery,"z3950search",'width=800,height=400,toolbar=false,scrollbars=yes');
 }
 
 function AddField(field) {