diff --git a/.gitignore b/.gitignore
index 088ba6b..ba7bc1f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,7 @@ Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
+
+# The crt0.o file should, under the currently suggested build scheme, be
+# recompiled every build anyway.
+crt0.o