diff --git a/dub.json b/dub.json
index c628dee..97f8d16 100644
--- a/dub.json
+++ b/dub.json
@@ -25,7 +25,8 @@
 	"configurations": [
 		{
 			"name": "executable",
-			"targetType": "executable"
+			"targetType": "executable",
+			"mainSourceFile": "source/app.d"
 		},
 		{
 			"name": "library",