diff --git a/consensus/ethash/ethash.go b/consensus/ethash/ethash.go
index 78892e1da85d..a012d0a583a9 100644
--- a/consensus/ethash/ethash.go
+++ b/consensus/ethash/ethash.go
@@ -223,7 +223,7 @@ func (c *cache) generate(dir string, limit int, test bool) {
 			size = 1024
 		}
 		// If we don't store anything on disk, generate and return.
-		if dir == "" {
+		if dir == "" || limit <= 0 {
 			c.cache = make([]uint32, size/4)
 			generateCache(c.cache, c.epoch, seed)
 			return
@@ -305,7 +305,7 @@ func (d *dataset) generate(dir string, limit int, test bool) {
 			dsize = 32 * 1024
 		}
 		// If we don't store anything on disk, generate and return
-		if dir == "" {
+		if dir == "" || limit <= 0 {
 			cache := make([]uint32, csize/4)
 			generateCache(cache, d.epoch, seed)
 
diff --git a/consensus/ethash/sealer.go b/consensus/ethash/sealer.go
index 43db1fcb7fd7..b313d35061b9 100644
--- a/consensus/ethash/sealer.go
+++ b/consensus/ethash/sealer.go
@@ -269,7 +269,7 @@ func (ethash *Ethash) remote(notify []string, noverify bool) {
 
 		start := time.Now()
 		if !noverify {
-			if err := ethash.verifySeal(nil, header, true); err != nil {
+			if err := ethash.verifySeal(nil, header, false); err != nil {
 				log.Warn("Invalid proof-of-work submitted", "sealhash", sealhash, "elapsed", common.PrettyDuration(time.Since(start)), "err", err)
 				return false
 			}