diff --git a/lib/zip_source_winzip_aes_encode.c b/lib/zip_source_winzip_aes_encode.c
index cf66da4..abbf7c6 100644
--- a/lib/zip_source_winzip_aes_encode.c
+++ b/lib/zip_source_winzip_aes_encode.c
@@ -163,6 +163,7 @@
 		/* TODO: return partial read? */
 		return -1;
 	    }
+	    buffer_n += _zip_buffer_read(ctx->buffer, data + ret, length - (zip_uint64_t)ret);
 	}
 
 	return (zip_int64_t)(buffer_n + (zip_uint64_t)ret);