diff --git a/projects/project_photoreceptor/Makefile b/projects/project_photoreceptor/Makefile
index dad25ce..2cd51bd 100644
--- a/projects/project_photoreceptor/Makefile
+++ b/projects/project_photoreceptor/Makefile
@@ -3,7 +3,7 @@ latex:
 	pdflatex *.tex > /dev/null
 
 clean:
-	rm -rf *.log *.aux *.zip *.out auto
+	rm -rf *.log *.aux *.out auto
 	rm -f `basename *.tex .tex`.pdf
 
 zip: latex