diff --git a/zconf.h b/zconf.h
index 7347d4b..12b60ca 100644
--- a/zconf.h
+++ b/zconf.h
@@ -71,6 +71,9 @@
 #  endif
 #  define crc32                 Z_ADD_PREFIX(crc32)
 #  define crc32_combine         Z_ADD_PREFIX(crc32_combine)
+#  define crc32_combine_gen     Z_ADD_PREFIX(crc32_combine_gen)
+#  define crc32_combine_gen64   Z_ADD_PREFIX(crc32_combine_gen64)
+#  define crc32_combine_op      Z_ADD_PREFIX(crc32_combine_op)
 #  define crc32_combine64       Z_ADD_PREFIX(crc32_combine64)
 #  define crc32_z               Z_ADD_PREFIX(crc32_z)
 #  define deflate               Z_ADD_PREFIX(deflate)