diff --git a/mongoose.c b/mongoose.c
index cbb90a6be8867ebdcaaa994349eec360d8904662..834a5daccf13a8b84bb03c693e4742716e29a326 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -1893,6 +1893,7 @@ static const struct {
   {".xml", 4, "text/xml"},
   {".json",  5, "text/json"},
   {".xslt", 5, "application/xml"},
+  {".xsl", 4, "application/xml"},
   {".ra",  3, "audio/x-pn-realaudio"},
   {".doc", 4, "application/msword"},
   {".exe", 4, "application/octet-stream"},