diff --git a/layouts/partials/single-book-rss-content.xml b/layouts/partials/single-book-rss-content.xml
index 03755c3..ea311e8 100644
--- a/layouts/partials/single-book-rss-content.xml
+++ b/layouts/partials/single-book-rss-content.xml
@@ -2,13 +2,12 @@
 <link>{{ .Site.Params.baseURL }}{{ .Permalink | relURL }}</link>
 <pubDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 GMT" }}</pubDate>
 <guid isPermaLink="true">
-{{- if and (ne .Params.external_mp3 "true") (ne .Params.external_mp3 "yes") -}}
-{{ .Site.Params.baseURL | string }}
+{{- if and (ne .Params.external_mp3 "true") (ne .Params.external_mp3 "yes") (ne .Params.external_mp3 "1") -}}
+{{- .Site.Params.baseURL | string -}}
 {{- end -}}
-{{ .Site.Params.mp3HTTPPrefix }}
-{{ .Params.mp3 | string }}
+{{- .Site.Params.mp3HTTPPrefix -}}{{- .Params.mp3 | string -}}
 </guid>
-<enclosure length="{{ .Params.length | string }}" url="{{ .Site.Params.statsPrefix }}{{- if and (ne .Params.external_mp3 "true") (ne .Params.external_mp3 "yes") -}}{{ .Site.Params.baseURL | string }}{{- end -}}{{ .Params.mp3 | string }}" type="audio/mpeg"/>
+<enclosure length="{{ .Params.length | string }}" url="{{ .Site.Params.statsPrefix }}{{- if and (ne .Params.external_mp3 "true") (ne .Params.external_mp3 "yes") (ne .Params.external_mp3 "1") -}}{{- .Site.Params.baseURL | string -}}{{- end -}}{{- .Params.mp3 | string -}}" type="audio/mpeg"/>
 <description>
   {{ `<![CDATA[` | safeHTML }}
   {{ .Content | safeHTML | truncate 3900 }}<br /><br />