diff --git a/core/fonts/private/GetMediaType.html b/core/fonts/private/GetMediaType.html
index dccf608..cc83a69 100644
--- a/core/fonts/private/GetMediaType.html
+++ b/core/fonts/private/GetMediaType.html
@@ -24,7 +24,7 @@
{{ $MainType = . }}
{{ end }}
-{{ $MediaType := "%s/%s" $MainType $SubType }}
+{{ $format := printf "%s/%s" $MainType $SubType }}
{{/* Another weirdness for some files depending on hosting plaftorm.
Some woff file would return application/font-woff