diff --git a/tests/aws/signed_params_tests.rb b/tests/aws/signed_params_tests.rb
index 07ad817c2..1b4ae21ad 100644
--- a/tests/aws/signed_params_tests.rb
+++ b/tests/aws/signed_params_tests.rb
@@ -8,10 +8,10 @@ Shindo.tests('AWS | signed_params', ['aws']) do
   end
 
   tests('Keys should be canonicalised using Unicode NFC') do
-    returns( Fog::AWS.escape( "\u{00e9}" ) ) { "%C3%A9" }
+    returns( Fog::AWS.escape( ["C3A9".to_i(16)].pack("U*") ) ) { "%C3%A9" }
 
     tests('Characters with combining mark should be combined and then escaped') do
-      returns( Fog::AWS.escape( "\u{0065}\u{0301}" ) ) { "%C3%A9" }
+      returns( Fog::AWS.escape( ["0065".to_i(16), "CC81".to_i(16)].pack("U*") ) ) { "%C3%A9" }
     end
   end
 end