diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
index 2813924ef710..1666e41525b1 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
@@ -3653,7 +3653,8 @@ static int
 arc_memory_throttle(uint64_t reserve, uint64_t inflight_data, uint64_t txg)
 {
 #ifdef _KERNEL
-	uint64_t available_memory = ptoa((uintmax_t)cnt.v_free_count);
+	uint64_t available_memory = ptoa((uintmax_t)cnt.v_free_count
+	    + cnt.v_cache_count);
 	static uint64_t page_load = 0;
 	static uint64_t last_txg = 0;