diff --git a/src/languages/fortran.coffee b/src/languages/fortran.coffee
index e2ba124..70935dc 100644
--- a/src/languages/fortran.coffee
+++ b/src/languages/fortran.coffee
@@ -15,6 +15,7 @@ module.exports = {
   ###
   extensions: [
     "f90"
+    "F90"
   ]
 
   ###