diff --git a/internal/nsupdate/nsupdate.go b/internal/nsupdate/nsupdate.go
index d588a62..c28a886 100644
--- a/internal/nsupdate/nsupdate.go
+++ b/internal/nsupdate/nsupdate.go
@@ -23,6 +23,8 @@ func New(keyLabel, keyAlgorithm, keySecret, server string, port int, zone string
 	}
 }
 
+const ENV_PATH string = "/usr/bin/env"
+
 var (
 	// escape characters
 	specialChars = []string{
@@ -43,7 +45,7 @@ func (c NsUpdateStruct) UpdateTXT(record, recordType, value string) error {
 	value = sanitizeTXT(value)
 
 	command := fmt.Sprintf("dig +short TXT %s", record)
-	cmd := exec.Command("/usr/bin/env", "sh", "-c", command)
+	cmd := exec.Command(ENV_PATH, "sh", "-c", command)
 	cmd.Stdout = &stdout
 	cmd.Stderr = &stderr
 	if err := cmd.Run(); err != nil {
@@ -90,7 +92,7 @@ EOF
 
 nsupdate -v -k <(printf '%%s' "${DDNS_KEY}") <(printf '%%s\n\n' "${COMMAND}")
 `, c.Key.Label, c.Key.Algorithm, c.Key.Secret, c.Server, record, strings.ToUpper(recordType))
-	cmd := exec.Command("/usr/bin/env", "sh", "-c", command)
+	cmd := exec.Command(ENV_PATH, "sh", "-c", command)
 	cmd.Stdout = &stdout
 	cmd.Stderr = &stderr
 	if err := cmd.Run(); err != nil {
@@ -122,7 +124,7 @@ EOF
 
 nsupdate -v -k <(printf '%%s' "${DDNS_KEY}") <(printf '%%s\n\n' "${COMMAND}")
 `, c.Key.Label, c.Key.Algorithm, c.Key.Secret, c.Server, record, strings.ToUpper(recordType), value)
-	cmd := exec.Command("/usr/bin/env", "sh", "-c", command)
+	cmd := exec.Command(ENV_PATH, "sh", "-c", command)
 	cmd.Stdout = &stdout
 	cmd.Stderr = &stderr
 	if err := cmd.Run(); err != nil {