diff --git a/device/awg/magic_header.go b/device/awg/magic_header.go
index f2b8f97..aaf4e97 100644
--- a/device/awg/magic_header.go
+++ b/device/awg/magic_header.go
@@ -26,8 +26,8 @@ func NewMagicHeader(min, max uint32) (MagicHeader, error) {
 }
 
 func ParseMagicHeader(key, value string) (MagicHeader, error) {
-	splitLimits := strings.Split(value, "-")
-	if len(splitLimits) != 2 {
+	hyphenIdx := strings.Index(value, "-")
+	if hyphenIdx == -1 {
 		// if there is no hyphen, we treat it as single magic header value
 		magicHeader, err := strconv.ParseUint(value, 10, 32)
 		if err != nil {
@@ -35,23 +35,27 @@ func ParseMagicHeader(key, value string) (MagicHeader, error) {
 		}
 
 		return NewMagicHeader(uint32(magicHeader), uint32(magicHeader))
-	} else if len(splitLimits[0]) == 0 || len(splitLimits[1]) == 0 {
+	}
+
+	minStr := value[:hyphenIdx]
+	maxStr := value[hyphenIdx+1:]
+	if len(minStr) == 0 || len(maxStr) == 0 {
 		return MagicHeader{}, fmt.Errorf("invalid value for key: %s; value: %s; expected format: min-max", key, value)
 	}
 
-	min, err := strconv.ParseUint(splitLimits[0], 10, 32)
+	min, err := strconv.ParseUint(minStr, 10, 32)
 	if err != nil {
-		return MagicHeader{}, fmt.Errorf("parse min key: %s; value: %s; %w", key, splitLimits[0], err)
+		return MagicHeader{}, fmt.Errorf("parse min key: %s; value: %s; %w", key, minStr, err)
 	}
 
-	max, err := strconv.ParseUint(splitLimits[1], 10, 32)
+	max, err := strconv.ParseUint(maxStr, 10, 32)
 	if err != nil {
-		return MagicHeader{}, fmt.Errorf("parse max key: %s; value: %s; %w", key, splitLimits[1], err)
+		return MagicHeader{}, fmt.Errorf("parse max key: %s; value: %s; %w", key, maxStr, err)
 	}
 
 	magicHeader, err := NewMagicHeader(uint32(min), uint32(max))
 	if err != nil {
-		return MagicHeader{}, fmt.Errorf("new magicHeader key: %s; value: %s-%s; %w", key, splitLimits[0], splitLimits[1], err)
+		return MagicHeader{}, fmt.Errorf("new magicHeader key: %s; value: %s-%s; %w", key, minStr, maxStr, err)
 	}
 
 	return magicHeader, nil