diff --git a/.gitignore b/.gitignore
index af213ca..829b0b0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,4 @@ out/
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 replay_pid*
+*.o