diff --git a/src/zconf.h b/src/zconf.h
--- a/src/zconf.h
+++ b/src/zconf.h
@@ -8,6 +8,9 @@
 #ifndef ZCONF_H
 #define ZCONF_H

+/* This header does prefixing as below, but with an updated set of names. */
+#include "mozzconf.h"
+
 /*
  * If you *really* need a unique prefix for all types and library functions,
  * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.