diff --git a/lib/jwt/algos/eddsa.rb b/lib/jwt/algos/eddsa.rb
index 1bd3d1e5..aec8b757 100644
--- a/lib/jwt/algos/eddsa.rb
+++ b/lib/jwt/algos/eddsa.rb
@@ -3,7 +3,7 @@ module Algos
     module Eddsa
       module_function
 
-      SUPPORTED = %w[Ed25519].freeze
+      SUPPORTED = %w[ED25519].freeze
 
       def sign(to_sign)
         algorithm, msg, key = to_sign.values
diff --git a/spec/jwt_spec.rb b/spec/jwt_spec.rb
index fbec8e90..a5e5f3d6 100644
--- a/spec/jwt_spec.rb
+++ b/spec/jwt_spec.rb
@@ -37,8 +37,8 @@
 
     if defined?(RbNaCl)
       data.merge!(
-        'Ed25519_private' =>  RbNaCl::Signatures::Ed25519::SigningKey.new('abcdefghijklmnopqrstuvwxyzABCDEF'),
-        'Ed25519_public' => RbNaCl::Signatures::Ed25519::SigningKey.new('abcdefghijklmnopqrstuvwxyzABCDEF').verify_key,
+        'ED25519_private' =>  RbNaCl::Signatures::Ed25519::SigningKey.new('abcdefghijklmnopqrstuvwxyzABCDEF'),
+        'ED25519_public' => RbNaCl::Signatures::Ed25519::SigningKey.new('abcdefghijklmnopqrstuvwxyzABCDEF').verify_key,
       )
     end
     data
@@ -190,7 +190,7 @@
   end
 
   if defined?(RbNaCl)
-    %w[Ed25519].each do |alg|
+    %w[ED25519].each do |alg|
       context "alg: #{alg}" do
         before(:each) do
           data[alg] = JWT.encode payload, data["#{alg}_private"], alg