--- a/toolkit/components/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.h
+++ b/toolkit/components/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.h
@@ -48,6 +48,7 @@
 #include <iosfwd>
 #include <memory>
 #include <string>
+#include <vector> /* Needed by GCC 4.9 on Android (see Bug 1186561) */

 #include <google/protobuf/stubs/callback.h>
 #include <google/protobuf/stubs/common.h>