diff --git a/contrib/minizip/ioapi.h b/contrib/minizip/ioapi.h
index 8dcbdb0..82ea3a9 100644
--- a/contrib/minizip/ioapi.h
+++ b/contrib/minizip/ioapi.h
@@ -94,7 +94,10 @@ typedef uint64_t ZPOS64_T;
 /* Maximum unsigned 32-bit value used as placeholder for zip64 */
 #define MAXU32 0xffffffff
 
-#if defined(_MSC_VER) || defined(__BORLANDC__)
+/* See https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04623066 (C)
+ * See https://support.hpe.com/hpsc/doc/public/display?docId=a00058500en_us   (C++)
+ */
+#if defined(_MSC_VER) || defined(__BORLANDC__) || ((defined(__DECC) || defined(__DECCXX)) && !defined(__osf) && (defined(__alpha) || defined(__ia64) || defined(__IA64))) || defined(__int64)
 typedef unsigned __int64 ZPOS64_T;
 #else
 typedef unsigned long long int ZPOS64_T;