diff --git a/.gitattributes b/.gitattributes
index a491beb33..85605b183 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -10,3 +10,5 @@
 # Denote all files that are truly binary and should not be modified.
 *.png binary
 *.jpg binary
+*.ihex binary
+*.s37 binary