diff --git a/.gitattributes b/.gitattributes
index 8560b794c0a7cb3525adfe30005f3da8d9b858e5..899473ab0fbbd38f4f5cc0690042da3c1c619ac5 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,2 +1,5 @@
 # Declare files that always have LF line endings on checkout
 * text eol=lf
+# Denote all files that are truly binary and should not be modified
+*.bmp binary
+*.ttf binary