diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 47b58b6c2e..8acb5d5efd 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -3430,7 +3430,6 @@ arc_hdr_realloc_crypt(arc_buf_hdr_t *hdr, boolean_t need_crypt)
 	arc_buf_hdr_t *nhdr;
 	arc_buf_t *buf;
 	kmem_cache_t *ncache, *ocache;
-	unsigned nsize, osize;
 
 	/*
 	 * This function requires that hdr is in the arc_anon state.
@@ -3447,14 +3446,10 @@ arc_hdr_realloc_crypt(arc_buf_hdr_t *hdr, boolean_t need_crypt)
 
 	if (need_crypt) {
 		ncache = hdr_full_crypt_cache;
-		nsize = sizeof (hdr->b_crypt_hdr);
 		ocache = hdr_full_cache;
-		osize = HDR_FULL_SIZE;
 	} else {
 		ncache = hdr_full_cache;
-		nsize = HDR_FULL_SIZE;
 		ocache = hdr_full_crypt_cache;
-		osize = sizeof (hdr->b_crypt_hdr);
 	}
 
 	nhdr = kmem_cache_alloc(ncache, KM_PUSHPAGE);