diff --git a/benchmark/worker/benchmark_client.go b/benchmark/worker/benchmark_client.go
index d0e8f05b..00adfa1d 100644
--- a/benchmark/worker/benchmark_client.go
+++ b/benchmark/worker/benchmark_client.go
@@ -148,7 +148,7 @@ func createConns(config *testpb.ClientConfig) ([]*grpc.ClientConn, func(), error
 
 	// Create connections.
 	connCount := int(config.ClientChannels)
-	conns := make([]*grpc.ClientConn, connCount, connCount)
+	conns := make([]*grpc.ClientConn, connCount)
 	for connIndex := 0; connIndex < connCount; connIndex++ {
 		conns[connIndex] = benchmark.NewClientConn(config.ServerTargets[connIndex%len(config.ServerTargets)], opts...)
 	}
@@ -228,7 +228,7 @@ func startBenchmarkClient(config *testpb.ClientConfig) (*benchmarkClient, error)
 			BaseBucketSize: (1 + config.HistogramParams.Resolution),
 			MinValue:       0,
 		},
-		lockingHistograms: make([]lockingHistogram, rpcCountPerConn*len(conns), rpcCountPerConn*len(conns)),
+		lockingHistograms: make([]lockingHistogram, rpcCountPerConn*len(conns)),
 
 		stop:            make(chan bool),
 		lastResetTime:   time.Now(),
@@ -340,7 +340,7 @@ func (bc *benchmarkClient) getStats(reset bool) *testpb.ClientStats {
 	if reset {
 		// Merging histogram may take some time.
 		// Put all histograms aside and merge later.
-		toMerge := make([]*stats.Histogram, len(bc.lockingHistograms), len(bc.lockingHistograms))
+		toMerge := make([]*stats.Histogram, len(bc.lockingHistograms))
 		for i := range bc.lockingHistograms {
 			toMerge[i] = bc.lockingHistograms[i].swap(stats.NewHistogram(bc.histogramOptions))
 		}
@@ -366,7 +366,7 @@ func (bc *benchmarkClient) getStats(reset bool) *testpb.ClientStats {
 		uTimeElapsed, sTimeElapsed = cpuTimeDiff(bc.rusageLastReset, latestRusage)
 	}
 
-	b := make([]uint32, len(mergedHistogram.Buckets), len(mergedHistogram.Buckets))
+	b := make([]uint32, len(mergedHistogram.Buckets))
 	for i, v := range mergedHistogram.Buckets {
 		b[i] = uint32(v.Count)
 	}
diff --git a/encoding/encoding.go b/encoding/encoding.go
index 8e26c194..ade8b7ce 100644
--- a/encoding/encoding.go
+++ b/encoding/encoding.go
@@ -82,7 +82,7 @@ type Codec interface {
 	Name() string
 }
 
-var registeredCodecs = make(map[string]Codec, 0)
+var registeredCodecs = make(map[string]Codec)
 
 // RegisterCodec registers the provided Codec for use with all gRPC clients and
 // servers.
diff --git a/proxy_test.go b/proxy_test.go
index 39ee123c..8466676c 100644
--- a/proxy_test.go
+++ b/proxy_test.go
@@ -113,7 +113,7 @@ func TestHTTPConnect(t *testing.T) {
 	}
 
 	msg := []byte{4, 3, 5, 2}
-	recvBuf := make([]byte, len(msg), len(msg))
+	recvBuf := make([]byte, len(msg))
 	done := make(chan struct{})
 	go func() {
 		in, err := blis.Accept()