diff --git a/output/layout_base.go b/output/layout_base.go
index a0d2bc4eb..01885474d 100644
--- a/output/layout_base.go
+++ b/output/layout_base.go
@@ -101,7 +101,7 @@ func CreateTemplateNames(d TemplateLookupDescriptor) (TemplateNames, error) {
 	filenameNoSuffix := parts[0]
 
 	id.OverlayFilename = fullPath
-	id.Name = name
+	id.Name = strings.ToLower(name)
 
 	if isPlainText {
 		id.Name = "_text/" + id.Name