diff --git a/libcontainer/integration/exec_test.go b/libcontainer/integration/exec_test.go
index c583901d8..a46f0a928 100644
--- a/libcontainer/integration/exec_test.go
+++ b/libcontainer/integration/exec_test.go
@@ -366,7 +366,7 @@ func TestProcessEmptyCaps(t *testing.T) {
 	// Wait for process
 	waitProcess(&pconfig, t)
 
-	outputStatus := string(stdout.Bytes())
+	outputStatus := stdout.String()
 
 	lines := strings.Split(outputStatus, "\n")
 
@@ -419,7 +419,7 @@ func TestProcessCaps(t *testing.T) {
 	// Wait for process
 	waitProcess(&pconfig, t)
 
-	outputStatus := string(stdout.Bytes())
+	outputStatus := stdout.String()
 
 	lines := strings.Split(outputStatus, "\n")
 
@@ -483,7 +483,7 @@ func TestAdditionalGroups(t *testing.T) {
 	// Wait for process
 	waitProcess(&pconfig, t)
 
-	outputGroups := string(stdout.Bytes())
+	outputGroups := stdout.String()
 
 	// Check that the groups output has the groups that we specified
 	if !strings.Contains(outputGroups, "audio") {
@@ -1082,7 +1082,7 @@ func TestSysctl(t *testing.T) {
 	// Wait for process
 	waitProcess(&pconfig, t)
 
-	shmmniOutput := string(bytes.TrimSpace(stdout.Bytes()))
+	shmmniOutput := strings.TrimSpace(stdout.String())
 	if shmmniOutput != "8192" {
 		t.Fatalf("kernel.shmmni property expected to be 8192, but is %s", shmmniOutput)
 	}
@@ -1210,7 +1210,7 @@ func TestOomScoreAdj(t *testing.T) {
 
 	// Wait for process
 	waitProcess(&pconfig, t)
-	outputOomScoreAdj := string(bytes.TrimSpace(stdout.Bytes()))
+	outputOomScoreAdj := strings.TrimSpace(stdout.String())
 
 	// Check that the oom_score_adj matches the value that was set as part of config.
 	if outputOomScoreAdj != strconv.Itoa(*config.OomScoreAdj) {
diff --git a/libcontainer/integration/execin_test.go b/libcontainer/integration/execin_test.go
index 583faa29f..72de06bcc 100644
--- a/libcontainer/integration/execin_test.go
+++ b/libcontainer/integration/execin_test.go
@@ -188,7 +188,7 @@ func TestExecInAdditionalGroups(t *testing.T) {
 	stdinW.Close()
 	waitProcess(process, t)
 
-	outputGroups := string(stdout.Bytes())
+	outputGroups := stdout.String()
 
 	// Check that the groups output has the groups that we specified
 	if !strings.Contains(outputGroups, "audio") {
@@ -471,7 +471,7 @@ func TestExecinPassExtraFiles(t *testing.T) {
 	stdinW.Close()
 	waitProcess(process, t)
 
-	out := string(stdout.Bytes())
+	out := stdout.String()
 	// fd 5 is the directory handle for /proc/$$/fd
 	if out != "0 1 2 3 4 5" {
 		t.Fatalf("expected to have the file descriptors '0 1 2 3 4 5' passed to exec, got '%s'", out)