diff --git a/auth0/src/main/java/com/auth0/android/request/internal/OidcUtils.kt b/auth0/src/main/java/com/auth0/android/request/internal/OidcUtils.kt
index bcb22f678..c7abfce9b 100644
--- a/auth0/src/main/java/com/auth0/android/request/internal/OidcUtils.kt
+++ b/auth0/src/main/java/com/auth0/android/request/internal/OidcUtils.kt
@@ -1,7 +1,5 @@
 package com.auth0.android.request.internal
 
-import java.util.*
-
 /**
  * Small utility class to handle OpenID Connect conformance
  */
@@ -19,8 +17,7 @@ internal object OidcUtils {
      */
     fun includeRequiredScope(scope: String): String {
         val existingScopes = scope.split(" ")
-            .map { it.toLowerCase(Locale.ROOT) }
-        return if (!existingScopes.contains(REQUIRED_SCOPE)) {
+        return if (existingScopes.none { it == REQUIRED_SCOPE }) {
             (existingScopes + REQUIRED_SCOPE).joinToString(separator = " ").trim()
         } else {
             scope
diff --git a/auth0/src/test/java/com/auth0/android/authentication/ParameterBuilderTest.java b/auth0/src/test/java/com/auth0/android/authentication/ParameterBuilderTest.java
index 9f771166c..d36da9438 100755
--- a/auth0/src/test/java/com/auth0/android/authentication/ParameterBuilderTest.java
+++ b/auth0/src/test/java/com/auth0/android/authentication/ParameterBuilderTest.java
@@ -68,6 +68,18 @@ public void shouldSetRefreshToken() {
         assertThat(parameters, hasEntry("refresh_token", DEVICE));
     }
 
+    @Test
+    public void shouldKeepScopeCaseWhenAddingRequiredScope() {
+        Map<String, String> parameters = builder.setScope("profile read:Messages").asDictionary();
+        assertThat(parameters, hasEntry("scope", "profile read:Messages openid"));
+    }
+
+    @Test
+    public void shouldAddRequiredScopeWhenOnlyAnotherCaseIsPresent() {
+        Map<String, String> parameters = builder.setScope("OpenID profile").asDictionary();
+        assertThat(parameters, hasEntry("scope", "OpenID profile openid"));
+    }
+
     @Test
     public void shouldSetScopeWithOfflineAccess() {
         Map<String, String> parameters = builder.setScope(ParameterBuilder.SCOPE_OFFLINE_ACCESS).asDictionary();