diff --git a/miner/worker.go b/miner/worker.go
index 1c87362f4..afab9a7e1 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -401,6 +401,7 @@ func recalcRecommit(minRecommit, prev time.Duration, target float64, inc bool) t
 	} else {
 		next = prevF*(1-intervalAdjustRatio) + intervalAdjustRatio*(target-intervalAdjustBias)
 		min := float64(minRecommit.Nanoseconds())
+		min = min + min*intervalAdjustRatio
 		if next < min {
 			next = min
 		}
diff --git a/miner/worker_test.go b/miner/worker_test.go
index 59fbbbcdc..defe0e818 100644
--- a/miner/worker_test.go
+++ b/miner/worker_test.go
@@ -297,9 +297,10 @@ func testAdjustInterval(t *testing.T, chainConfig *params.ChainConfig, engine co
 			estimate := origin*(1-intervalAdjustRatio) + intervalAdjustRatio*(origin/0.8+intervalAdjustBias)
 			wantMinInterval, wantRecommitInterval = 3*time.Second, time.Duration(estimate)*time.Nanosecond
 		case 2:
-			estimate := result[index-1]
+			// estimate := result[index-1]
 			min := float64(3 * time.Second.Nanoseconds())
-			estimate = estimate*(1-intervalAdjustRatio) + intervalAdjustRatio*(min-intervalAdjustBias)
+			// estimate = estimate*(1-intervalAdjustRatio) + intervalAdjustRatio*(min-intervalAdjustBias)
+			estimate := min + min*intervalAdjustRatio
 			wantMinInterval, wantRecommitInterval = 3*time.Second, time.Duration(estimate)*time.Nanosecond
 		case 3:
 			wantMinInterval, wantRecommitInterval = time.Second, time.Second