diff --git a/crypto/types/compact_bit_array.go b/crypto/types/compact_bit_array.go
index 741509f7753a..8761d21f63ba 100644
--- a/crypto/types/compact_bit_array.go
+++ b/crypto/types/compact_bit_array.go
@@ -92,7 +92,7 @@ func (bA *CompactBitArray) NumTrueBitsBefore(index int) int {
 		index = max
 	}
 	// below we iterate over the bytes then over bits (in low endian) and count bits set to 1
-	for elem := 0; elem < len(bA.Elems); elem++ {
+	for elem := range bA.Elems {
 		if elem*8+7 >= index {
 			onesCount += bits.OnesCount8(bA.Elems[elem] >> (7 - (index % 8) + 1))
 			return onesCount