diff --git a/Makefile b/Makefile
index dddb704..b3aa9c8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-PNGS = built/screen_sequence_diagram built/use_cases_diagram.png built/schema_diagram.png built/schema_graph.png
+PNGS = built/screen_sequence_diagram.png built/use_cases_diagram.png built/schema_diagram.png built/schema_graph.png
 PDFS = built/DesignUseCases.pdf
 
 all: built/ $(PNGS) $(PDFS)