diff --git a/.gitignore b/.gitignore
index e32f65ade7d..b28f07cfd1c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 *.pyo
 __pycache__
 *.so
+*.o
 
 Cython/Compiler/*.c
 Cython/Plex/*.c
diff --git a/.hgignore b/.hgignore
index 7162bc6e192..30fbc7af4dd 100644
--- a/.hgignore
+++ b/.hgignore
@@ -19,6 +19,7 @@ dist/
 *.dep
 *.swp
 *.so
+*.o
 *~
 
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