diff --git a/utils/Felt.go b/utils/Felt.go
index 78570fd4..8d00831f 100644
--- a/utils/Felt.go
+++ b/utils/Felt.go
@@ -40,15 +40,17 @@ func HexToFelt(hex string) (*felt.Felt, error) {
 // - []*felt.Felt: an array of *felt.Felt objects, or nil if there was
 // - error: an error if any
 func HexArrToFelt(hexArr []string) ([]*felt.Felt, error) {
-	var feltArr []*felt.Felt
-	for _, hex := range hexArr {
-		felt, err := HexToFelt(hex)
-		if err != nil {
-			return nil, err
-		}
-		feltArr = append(feltArr, felt)
-	}
-	return feltArr, nil
+
+ feltArr := make([]*felt.Felt, len(hexArr))
+ for i, e := range hexArr {
+  felt, err := HexToFelt(e)
+  if err != nil {
+   return nil, err
+  }
+  feltArr[i] = felt
+ }
+ return feltArr, nil
+
 }
 
 // FeltToBigInt converts a Felt value to a *big.Int.