diff --git a/rpc_util_test.go b/rpc_util_test.go
index 56cac330..80989961 100644
--- a/rpc_util_test.go
+++ b/rpc_util_test.go
@@ -153,25 +153,6 @@ func TestContextErr(t *testing.T) {
 	}
 }
 
-func TestBackoff(t *testing.T) {
-	for _, test := range []struct {
-		retries   int
-		maxResult time.Duration
-	}{
-		{0, time.Second},
-		{1, time.Duration(1e9 * math.Pow(backoffFactor, 1))},
-		{2, time.Duration(1e9 * math.Pow(backoffFactor, 2))},
-		{3, time.Duration(1e9 * math.Pow(backoffFactor, 3))},
-		{4, time.Duration(1e9 * math.Pow(backoffFactor, 4))},
-		{int(math.Log2(float64(maxDelay)/float64(baseDelay))) + 1, maxDelay},
-	} {
-		delay := backoff(test.retries)
-		if delay < 0 || delay > test.maxResult {
-			t.Errorf("backoff(%d) = %v outside [0, %v]", test.retries, delay, test.maxResult)
-		}
-	}
-}
-
 // bmEncode benchmarks encoding a Protocol Buffer message containing mSize
 // bytes.
 func bmEncode(b *testing.B, mSize int) {