diff --git a/bauh/gems/arch/worker.py b/bauh/gems/arch/worker.py
index c3797947..487545fd 100644
--- a/bauh/gems/arch/worker.py
+++ b/bauh/gems/arch/worker.py
@@ -245,7 +245,7 @@ class ArchCompilationOptimizer(Thread):
 
             self._update_progress(80)
 
-            if optimizations:
+            if custom_makepkg and optimizations:
                 generated_by = '# <generated by bauh>\n'
                 custom_makepkg = custom_makepkg + '\n' + generated_by + '\n'.join(optimizations) + '\n'