diff --git a/service_windows.go b/service_windows.go
index 07ad04a..7a2aa33 100644
--- a/service_windows.go
+++ b/service_windows.go
@@ -252,9 +252,12 @@ func (ws *windowsService) setEnvironmentVariablesInRegistry() error {
 		envStrings = append(envStrings, k+"="+v)
 	}
 
-	if err := k.SetStringsValue("Environment", envStrings); err != nil {
-		return fmt.Errorf("failed setting env var registry key, err = %v", err)
+	if len(envStrings) > 0 {
+		if err := k.SetStringsValue("Environment", envStrings); err != nil {
+			return fmt.Errorf("failed setting env var registry key, err = %v", err)
+		}
 	}
+
 	if err := k.Close(); err != nil {
 		return fmt.Errorf("failed closing env var registry key, err = %v", err)
 	}