diff --git a/src/RestSharp/Authenticators/OAuth/OAuthTools.cs b/src/RestSharp/Authenticators/OAuth/OAuthTools.cs
index f48400fbc..462e0bf88 100644
--- a/src/RestSharp/Authenticators/OAuth/OAuthTools.cs
+++ b/src/RestSharp/Authenticators/OAuth/OAuthTools.cs
@@ -142,7 +142,7 @@ public static string GetNonce() {
     internal static IEnumerable<string> SortParametersExcludingSignature(WebPairCollection parameters)
         => parameters
             .Where(x => !x.Name.EqualsIgnoreCase("oauth_signature"))
-            .Select(x => new WebPair(UrlEncodeStrict(x.Name), UrlEncodeStrict(x.Value)))
+            .Select(x => new WebPair(UrlEncodeStrict(x.Name), UrlEncodeRelaxed(x.Value)))
             .OrderBy(x => x, WebPair.Comparer)
             .Select(x => x.GetQueryParameter(false));
 
diff --git a/test/RestSharp.Tests.Integrated/OAuth1Tests.cs b/test/RestSharp.Tests.Integrated/OAuth1Tests.cs
index b81fd4d51..04827b1f8 100644
--- a/test/RestSharp.Tests.Integrated/OAuth1Tests.cs
+++ b/test/RestSharp.Tests.Integrated/OAuth1Tests.cs
@@ -51,17 +51,29 @@ public async Task Can_Authenticate_OAuth1_With_Querystring_Parameters() {
         actual.Should().BeEquivalentTo(expected);
     }
 
-    [Fact]
-    public void Properly_Encodes_Parameter_Names() {
-        var postData = new WebPairCollection {
-            { "name[first]", "Chuck" },
-            { "name[last]", "Testa" }
-        };
+    [Theory]
+    [MemberData(nameof(EncodeParametersTestData))]
+    public void Properly_Encodes_Parameter_Names(IList<(string, string)> parameters, string expected) {
+        var postData = new WebPairCollection();
+        postData.AddRange(parameters.Select(x => new WebPair(x.Item1, x.Item2)));
         var sortedParams = OAuthTools.SortParametersExcludingSignature(postData);
 
-        sortedParams.First().Should().Be("name%5Bfirst%5D=Chuck");
+        sortedParams.First().Should().Be(expected);
     }
 
+    public static IEnumerable<object[]> EncodeParametersTestData =>
+        new List<object[]>
+        {
+            new object[] {
+                new List<(string, string)> { ("name[first]", "Chuck"), ("name[last]", "Testa") },
+                "name%5Bfirst%5D=Chuck"
+            },
+            new object[] {
+                new List<(string, string)> { ("country", "España") },
+                "country=Espa%C3%B1a"
+            }
+        };
+
     [Fact]
     public void Use_RFC_3986_Encoding_For_Auth_Signature_Base() {
         // reserved characters for 2396 and 3986