diff --git a/bench/cec2020/benchFunctions.go b/bench/cec2020/benchFunctions.go
index b4e5ca4..9359ea6 100644
--- a/bench/cec2020/benchFunctions.go
+++ b/bench/cec2020/benchFunctions.go
@@ -176,7 +176,7 @@ func Composition1(x []float64) float64 {
 
 	var sum float64
 
-	var weights []float64
+	weights := make([]float64, len(funcs))
 
 	for i := range funcs {
 		wi := getWeight(x, o, sigma[i], fnx)