diff --git a/controllers/document.go b/controllers/document.go
index faa95669..87481969 100644
--- a/controllers/document.go
+++ b/controllers/document.go
@@ -903,11 +903,11 @@ func (c *DocumentController) Export() {
 
 		c.Abort("200")
 	} else if output == "mobi" {
-		c.Ctx.Output.Download(eBookResult.MobiPath, bookResult.BookName+".epub")
+		c.Ctx.Output.Download(eBookResult.MobiPath, bookResult.BookName+".mobi")
 
 		c.Abort("200")
 	} else if output == "docx" {
-		c.Ctx.Output.Download(eBookResult.WordPath, bookResult.BookName+".epub")
+		c.Ctx.Output.Download(eBookResult.WordPath, bookResult.BookName+".docx")
 
 		c.Abort("200")
 	}