diff --git a/api/config.go b/api/config.go
index 7fa518e..6115bf8 100644
--- a/api/config.go
+++ b/api/config.go
@@ -63,12 +63,14 @@ func configParse() error {
 	}
 
 	os.Setenv("ORIGIN", strings.TrimSuffix(os.Getenv("ORIGIN"), "/"))
+	os.Setenv("ORIGIN", addHttpIfAbsent(os.Getenv("ORIGIN")))
 
 	if os.Getenv("CDN_PREFIX") == "" {
 		os.Setenv("CDN_PREFIX", os.Getenv("ORIGIN"))
 	}
 
 	os.Setenv("CDN_PREFIX", strings.TrimSuffix(os.Getenv("ORIGIN"), "/"))
+	os.Setenv("CDN_PREFIX", addHttpIfAbsent(os.Getenv("CDN_PREFIX")))
 
 	if os.Getenv("FORBID_NEW_OWNERS") != "true" && os.Getenv("FORBID_NEW_OWNERS") != "false" {
 		logger.Errorf("COMMENTO_FORBID_NEW_OWNERS neither 'true' nor 'false'")
diff --git a/api/utils_sanitise.go b/api/utils_sanitise.go
index 087b274..bf59643 100644
--- a/api/utils_sanitise.go
+++ b/api/utils_sanitise.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"regexp"
+	"strings"
 )
 
 var prePlusMatch = regexp.MustCompile(`([^@\+]*)\+?(.*)@.*`)
@@ -43,3 +44,11 @@ func isHttpsUrl(in string) bool {
 	// solves this. If this function returns false, prefix with "http://"
 	return len(httpsUrl.FindAllString(in, -1)) != 0
 }
+
+func addHttpIfAbsent(in string) string {
+	if !strings.HasPrefix(in, "http://") && !strings.HasPrefix(in, "https://") {
+		return "http://" + in
+	}
+
+	return in
+}