diff --git a/oauth2/oauth2-core/src/main/java/org/springframework/security/oauth2/core/ClientAuthenticationMethod.java b/oauth2/oauth2-core/src/main/java/org/springframework/security/oauth2/core/ClientAuthenticationMethod.java
index 7193f90eb63..b7eb723b809 100644
--- a/oauth2/oauth2-core/src/main/java/org/springframework/security/oauth2/core/ClientAuthenticationMethod.java
+++ b/oauth2/oauth2-core/src/main/java/org/springframework/security/oauth2/core/ClientAuthenticationMethod.java
@@ -102,7 +102,7 @@ public boolean equals(Object obj) {
 			return false;
 		}
 		ClientAuthenticationMethod that = (ClientAuthenticationMethod) obj;
-		return this.getValue().equalsIgnoreCase(that.getValue());
+		return this.getValue().equals(that.getValue());
 	}
 
 	@Override