diff --git a/libbeat/processors/fingerprint/fingerprint_test.go b/libbeat/processors/fingerprint/fingerprint_test.go
index 5f6bdb70b5ed..8d66762e479c 100644
--- a/libbeat/processors/fingerprint/fingerprint_test.go
+++ b/libbeat/processors/fingerprint/fingerprint_test.go
@@ -505,7 +505,7 @@ func nRandomEvents(num int) []beat.Event {
 	charsetLen := len(charset)
 	b := make([]byte, 200)
 
-	events := make([]beat.Event, num)
+	events := make([]beat.Event, 0, num)
 	for i := 0; i < num; i++ {
 		for j := range b {
 			b[j] = charset[prng.Intn(charsetLen)]
diff --git a/libbeat/processors/ratelimit/limit.go b/libbeat/processors/ratelimit/limit.go
index 0d6f14d88d77..c989e4a25276 100644
--- a/libbeat/processors/ratelimit/limit.go
+++ b/libbeat/processors/ratelimit/limit.go
@@ -52,7 +52,7 @@ func (l *rate) Unpack(str string) error {
 	}
 
 	if allowed := []unit{unitPerSecond, unitPerMinute, unitPerHour}; !contains(allowed, unitStr) {
-		allowedStrs := make([]string, len(allowed))
+		allowedStrs := make([]string, 0, len(allowed))
 		for _, a := range allowed {
 			allowedStrs = append(allowedStrs, "/"+string(a))
 		}