diff --git a/src/config/param.hp_ux11i.h b/src/config/param.hp_ux11i.h
index 57730f2d4c..ec4e908528 100644
--- a/src/config/param.hp_ux11i.h
+++ b/src/config/param.hp_ux11i.h
@@ -26,6 +26,7 @@
 #define AFS_64BIT_ENV		1	/* Defines afs_int32 as int, not long. */
 #define AFS_64BIT_CLIENT	1
 #define AFS_64BITPOINTER_ENV	1	/* pointers are 64 bits. */
+#define AFS_64BIT_IOPS_ENV      1
 
 #include <afs/afs_sysnames.h>