diff --git a/default.gpr b/default.gpr
index 7437fd5..96aed41 100644
--- a/default.gpr
+++ b/default.gpr
@@ -1,6 +1,6 @@
 project Default is
-
-   for Main use ("main");
+   for Languages use ("ada", "c");
+   for Main use ("main.c");
    for Source_Dirs use ("src");
 
    package Builder is