diff --git a/addons/report/views/layouts.xml b/addons/report/views/layouts.xml
index 51806bda0c8..bff67a9051a 100644
--- a/addons/report/views/layouts.xml
+++ b/addons/report/views/layouts.xml
@@ -95,7 +95,7 @@
     <div class="header">
         <div class="row">
             <div class="col-xs-3">
-                <img t-if="company.logo" t-att-src="'data:image/png;base64,' + company.logo"/>
+                <img t-if="company.logo" t-att-src="'data:image/png;base64,%s' % company.logo"/>
             </div>
             <div class="col-xs-9 text-right" style="margin-top:20px;" t-field="company.rml_header1"/>
         </div>