diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ansi/AnsiOutput.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ansi/AnsiOutput.java
index 1c9c7c9cdf..33f9f799a3 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ansi/AnsiOutput.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ansi/AnsiOutput.java
@@ -151,7 +151,7 @@ public abstract class AnsiOutput {
 			if ((consoleAvailable == null) && (System.console() == null)) {
 				return false;
 			}
-			return !(OPERATING_SYSTEM_NAME.indexOf("win") >= 0);
+			return !(OPERATING_SYSTEM_NAME.contains("win"));
 		}
 		catch (Throwable ex) {
 			return false;