diff --git a/alire.gpr b/alire.gpr
index d8a7c982..e93fb04d 100644
--- a/alire.gpr
+++ b/alire.gpr
@@ -2,7 +2,7 @@ with "semantic_versioning.gpr";
 
 project Alire is
 
-   for Source_Dirs use ("index", "src");
+   for Source_Dirs use ("index", "index/**", "src");
    for Object_Dir use "obj";
    for Library_Name use "alire";
    for Library_Dir use "lib";