diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/ConfigurationPropertyNameTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/ConfigurationPropertyNameTests.java
index acf1bcd69d6..43bfa6de13e 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/ConfigurationPropertyNameTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/ConfigurationPropertyNameTests.java
@@ -600,6 +600,15 @@ public class ConfigurationPropertyNameTests {
 		assertThat((Object) n14).isNotEqualTo(n15);
 	}
 
+	@Test
+	public void equalsWhenStartsWith() {
+		// gh-14665
+		ConfigurationPropertyName n1 = ConfigurationPropertyName.of("my.sources[0].xame");
+		ConfigurationPropertyName n2 = ConfigurationPropertyName
+				.of("my.sources[0].xamespace");
+		assertThat(n1).isNotEqualTo(n2);
+	}
+
 	@Test
 	public void isValidWhenValidShouldReturnTrue() {
 		assertThat(ConfigurationPropertyName.isValid("")).isTrue();