diff --git a/contrib/unzip/crypt.h b/contrib/unzip/crypt.h
index 5d3d8aeb4..f14a628b4 100644
--- a/contrib/unzip/crypt.h
+++ b/contrib/unzip/crypt.h
@@ -34,7 +34,6 @@
  */
 static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab)
 {
-    (void)pcrc_32_tab;
     unsigned temp;  /* POTENTIAL BUG:  temp*(temp^1) may overflow in an
                      * unpredictable manner on 16-bit systems; not a problem
                      * with any known compiler so far, though */