diff --git a/static/templates/certificate/de.html b/static/templates/certificate/de.html
index 82f9458..8948736 100644
--- a/static/templates/certificate/de.html
+++ b/static/templates/certificate/de.html
@@ -12,7 +12,7 @@
       box-sizing: border-box;
       page-break-after: always;
       padding: 1.2cm 2cm 1.2cm 2cm;
-      background-image: url("data:image/png;base64,{{ loadImage 'certificate_background' }}");
+      background-image: url("data:image/png;base64,{{ loadImage "certificate_background" }}");
       background-repeat: no-repeat;
       background-size: 11cm;
       background-position: 5cm 5cm;
diff --git a/static/templates/certificate/en.html b/static/templates/certificate/en.html
index d8f4d6f..db5cf08 100644
--- a/static/templates/certificate/en.html
+++ b/static/templates/certificate/en.html
@@ -12,7 +12,7 @@
       box-sizing: border-box;
       page-break-after: always;
       padding: 1.2cm 2cm 1.2cm 2cm;
-      background-image: url("data:image/png;base64,{{ loadImage 'certificate_background' }}");
+      background-image: url("data:image/png;base64,{{ loadImage "certificate_background" }}");
       background-repeat: no-repeat;
       background-size: 11cm;
       background-position: 5cm 5cm;