diff --git a/archival/libarchive/lzo1x_d.c b/archival/libarchive/lzo1x_d.c
index 40b167e..43cf4a0 100644
--- a/archival/libarchive/lzo1x_d.c
+++ b/archival/libarchive/lzo1x_d.c
@@ -31,8 +31,7 @@
 ************************************************************************/
 /* safe decompression with overrun testing */
 int lzo1x_decompress_safe(const uint8_t* in, unsigned in_len,
-		uint8_t* out, unsigned* out_len,
-		void* wrkmem UNUSED_PARAM)
+		uint8_t* out, unsigned* out_len /*, void* wrkmem */)
 {
 	register uint8_t* op;
 	register const uint8_t* ip;