diff --git a/tools/build b/tools/build
index c6127e7..a5c44cb 100755
--- a/tools/build
+++ b/tools/build
@@ -10,4 +10,5 @@ path_prj_to=heimdall.prj.json
 
 cp ${path_prj_from} ${path_prj_to}
 koralle --execute ${path_prj_to}
+chmod +r build/heimdall
 rm ${path_prj_to}