diff --git a/integration-cli/docker_utils.go b/integration-cli/docker_utils.go
index c6662a84b8..964ef2d4d9 100644
--- a/integration-cli/docker_utils.go
+++ b/integration-cli/docker_utils.go
@@ -1093,6 +1093,7 @@ func writeFile(dst, content string, c *check.C) {
 	if err != nil {
 		c.Fatal(err)
 	}
+	defer f.Close()
 	// Write content (truncate if it exists)
 	if _, err := io.Copy(f, strings.NewReader(content)); err != nil {
 		c.Fatal(err)