diff --git a/discovery/file/file.go b/discovery/file/file.go
index 41c2e0d234..afe1efdb76 100644
--- a/discovery/file/file.go
+++ b/discovery/file/file.go
@@ -24,7 +24,7 @@ func (s *FileDiscoveryService) Initialize(path string, heartbeat int) error {
 }
 
 func parseFileContent(content []byte) []string {
-	result := make([]string, 0)
+	var result []string
 	for _, line := range strings.Split(strings.TrimSpace(string(content)), "\n") {
 		for _, ip := range discovery.Generate(line) {
 			result = append(result, ip)
diff --git a/discovery/generator.go b/discovery/generator.go
index d95c5ce3d8..81c19f6b33 100644
--- a/discovery/generator.go
+++ b/discovery/generator.go
@@ -27,7 +27,7 @@ func Generate(pattern string) []string {
 
 	template := re.ReplaceAllString(pattern, "%d")
 
-	result := make([]string, 0)
+	var result []string
 	for val := from; val <= to; val++ {
 		entry := fmt.Sprintf(template, val)
 		result = append(result, entry)