diff --git a/bindings/ruby/.gitignore b/bindings/ruby/.gitignore
index fa257520..d682798a 100644
--- a/bindings/ruby/.gitignore
+++ b/bindings/ruby/.gitignore
@@ -4,3 +4,4 @@
 Makefile
 mkmf.log
 notmuch.so
+*.o