diff --git a/contrib/unzip/crypt.h b/contrib/unzip/crypt.h
index 622f4bc2e..5fd3dcd6c 100644
--- a/contrib/unzip/crypt.h
+++ b/contrib/unzip/crypt.h
@@ -45,7 +45,7 @@ static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab)
 /***********************************************************************
  * Update the encryption keys with the next byte of plain text
  */
-static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c)
+static int update_keys(unsigned long* pkeys,const z_crc_t* pcrc_32_tab,int c)
 {
     (*(pkeys+0)) = CRC32((*(pkeys+0)), c);
     (*(pkeys+1)) += (*(pkeys+0)) & 0xff;
diff --git a/contrib/unzip/unzip.c b/contrib/unzip/unzip.c
index 9ad4766d8..e9ad1ff99 100644
--- a/contrib/unzip/unzip.c
+++ b/contrib/unzip/unzip.c
@@ -147,7 +147,7 @@ typedef struct
     int encrypted;
 #    ifndef NOUNCRYPT
     unsigned long keys[3];     /* keys defining the pseudo-random sequence */
-    const unsigned long* pcrc_32_tab;
+    const z_crc_t* pcrc_32_tab;
 #    endif
 } unz_s;