diff --git a/modules/base/markdown.go b/modules/base/markdown.go
index e49e111c0..2273cd772 100644
--- a/modules/base/markdown.go
+++ b/modules/base/markdown.go
@@ -36,7 +36,7 @@ func isLink(link []byte) bool {
 func IsMarkdownFile(name string) bool {
 	name = strings.ToLower(name)
 	switch filepath.Ext(name) {
-	case "md", "markdown", "mdown":
+	case ".md", ".markdown", ".mdown":
 		return true
 	}
 	return false
diff --git a/routers/repo/single.go b/routers/repo/single.go
index 49eb55d3e..e218bc915 100644
--- a/routers/repo/single.go
+++ b/routers/repo/single.go
@@ -96,7 +96,11 @@ func Single(ctx *middleware.Context, params martini.Params) {
 		} else {
 			ctx.Data["IsFile"] = true
 			ctx.Data["FileName"] = repoFile.Name
-			ctx.Data["FileExt"] = path.Ext(repoFile.Name)
+			ext := path.Ext(repoFile.Name)
+			if len(ext) > 0 {
+				ext = ext[1:]
+			}
+			ctx.Data["FileExt"] = ext
 
 			readmeExist := base.IsMarkdownFile(repoFile.Name) || base.IsReadmeFile(repoFile.Name)
 			ctx.Data["ReadmeExist"] = readmeExist