diff --git a/snappy-stubs-public.h.in b/snappy-stubs-public.h.in
index ebe676c..96989ac 100644
--- a/snappy-stubs-public.h.in
+++ b/snappy-stubs-public.h.in
@@ -80,9 +80,11 @@
 
 typedef std::string string;
 
+#ifndef DISALLOW_COPY_AND_ASSIGN
 #define DISALLOW_COPY_AND_ASSIGN(TypeName) \
   TypeName(const TypeName&);               \
   void operator=(const TypeName&)
+#endif
 
 #if !@ac_cv_have_sys_uio_h@
 // Windows does not have an iovec type, yet the concept is universally useful.