diff --git a/src/ArgumentParsing.Generators/ArgumentParserGenerator.Extract.cs b/src/ArgumentParsing.Generators/ArgumentParserGenerator.Extract.cs
index ceecba8..0a5c40a 100644
--- a/src/ArgumentParsing.Generators/ArgumentParserGenerator.Extract.cs
+++ b/src/ArgumentParsing.Generators/ArgumentParserGenerator.Extract.cs
@@ -484,7 +484,7 @@ private static (OptionsInfo? OptionsInfo, OptionsHelpInfo? OptionsHelpInfo) Extr
         var qualifiedName = optionsType.ToDisplayString(s_qualifiedNameFormat);
         var optionsInfo = new OptionsInfo(
             qualifiedName,
-            optionsType.DeclaredAccessibility >= Accessibility.Internal,
+            optionsType.HasMinimalAccessibility(Accessibility.Internal),
             optionsBuilder.ToImmutable(),
             parametersBuilder.ToImmutable(),
             remainingParametersInfo,
diff --git a/src/ArgumentParsing.Generators/Diagnostics/Analyzers/OptionsTypeAnalyzer.cs b/src/ArgumentParsing.Generators/Diagnostics/Analyzers/OptionsTypeAnalyzer.cs
index 736a3dc..6458913 100644
--- a/src/ArgumentParsing.Generators/Diagnostics/Analyzers/OptionsTypeAnalyzer.cs
+++ b/src/ArgumentParsing.Generators/Diagnostics/Analyzers/OptionsTypeAnalyzer.cs
@@ -137,7 +137,7 @@ private static void AnalyzeOptionsType(SymbolAnalysisContext context, LanguageVe
             }
         }
 
-        if (optionsType.DeclaredAccessibility < Accessibility.Internal)
+        if (!optionsType.HasMinimalAccessibility(Accessibility.Internal))
         {
             context.ReportDiagnostic(
                 Diagnostic.Create(
diff --git a/tests/ArgumentParsing.Tests.Unit/OptionsTypeAnalyzerTests.cs b/tests/ArgumentParsing.Tests.Unit/OptionsTypeAnalyzerTests.cs
index f47c8ca..b0bb375 100644
--- a/tests/ArgumentParsing.Tests.Unit/OptionsTypeAnalyzerTests.cs
+++ b/tests/ArgumentParsing.Tests.Unit/OptionsTypeAnalyzerTests.cs
@@ -1529,6 +1529,28 @@ class C
 
         await VerifyAnalyzerAsync(source);
     }
+    [Theory]
+    [InlineData("")]
+    [InlineData("private")]
+    [InlineData("protected")]
+    public async Task TooLowOptionsTypeAccessibility_NestedType(string containingTypeAccessibility)
+    {
+        var source = $$"""
+            class Outer
+            {
+                {{containingTypeAccessibility}} class C
+                {
+                    [OptionsType]
+                    public class {|ARGP0032:Options|}
+                    {
+                    }
+                }
+            }
+            """;
+
+        await VerifyAnalyzerAsync(source);
+    }
+
 
     [Fact]
     public async Task NoShortAndLongName()