diff --git a/lib/zip_algorithm_zstd.c b/lib/zip_algorithm_zstd.c
index 46a1a03..b7aca8b 100644
--- a/lib/zip_algorithm_zstd.c
+++ b/lib/zip_algorithm_zstd.c
@@ -248,11 +248,15 @@
 
 /* clang-format off */
 
+/* Version Required should be set to 63 (6.3) because this compression
+   method was only defined in appnote.txt version 6.3.7, but Winzip
+   does not unpack it if the value is not 20. */
+
 zip_compression_algorithm_t zip_algorithm_zstd_compress = {
     compress_allocate,
     deallocate,
     general_purpose_bit_flags,
-    63,
+    20,
     start,
     end,
     input,
@@ -265,7 +269,7 @@
     decompress_allocate,
     deallocate,
     general_purpose_bit_flags,
-    63,
+    20,
     start,
     end,
     input,