diff --git a/previewer/code.go b/previewer/code.go
index c32ce7b..0b0096e 100644
--- a/previewer/code.go
+++ b/previewer/code.go
@@ -35,7 +35,8 @@ var ExtJSMap = map[string]template.HTML{
 	".xml":    "xml",
 	".coffee": "coffee",
 	".sh":     "sh",
-	".log":     "log",
+	".log":    "log",
+	".conf":   "conf",
 }
 
 func (i *Code) Preview(content []byte) template.HTML {
diff --git a/previewer/previewer.go b/previewer/previewer.go
index fe23f6e..8f0a986 100644
--- a/previewer/previewer.go
+++ b/previewer/previewer.go
@@ -44,7 +44,7 @@ var image = new(Image)
 var codeExtensions = [...]string{
 	".go", ".php", ".html", ".css", ".js", ".py", ".md",
 	".c", ".cpp", ".java", ".sh", ".tmpl", ".mod", ".sum",
-	".sql", ".json", ".txt", ".yml", "yaml", ".log",
+	".sql", ".json", ".txt", ".yml", "yaml", ".log", ".conf",
 }
 
 func IsCode(ext string) bool {