diff --git a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/generic/prod/make.defaults b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/generic/prod/make.defaults
index c74c0b1227..78d2ac8e77 100644
--- a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/generic/prod/make.defaults
+++ b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/generic/prod/make.defaults
@@ -3,7 +3,7 @@
 
 # Restrictive mask for production images.
 INSTALL_MASK="${INSTALL_MASK}
-  *.a *.la *.h *.hpp
+  *.a *.la *.h *.hpp *.o
   /etc/sandbox.d
   /usr/include
   /usr/lib/debug