1 files changed, 1 insertions, 1 deletions
diff --git a/zconf.h b/zconf.h
index 371f755..aed84f2 100644
--- a/zconf.h
+++ b/zconf.h
@@ -218,7 +218,7 @@
 #  endif
 #endif
 
-#if defined(ZLIB_CONST) && !defined(z_const)
+#if ( defined(ZLIB_CONST) || defined(__cplusplus) ) && !defined(z_const)
 #  define z_const const
 #else
 #  define z_const