diff --git a/src/Framework/Framework/Compilation/Directives/MarkupDirectiveCompilerPipeline.cs b/src/Framework/Framework/Compilation/Directives/MarkupDirectiveCompilerPipeline.cs
index 2475e84115..9c854e3f9b 100644
--- a/src/Framework/Framework/Compilation/Directives/MarkupDirectiveCompilerPipeline.cs
+++ b/src/Framework/Framework/Compilation/Directives/MarkupDirectiveCompilerPipeline.cs
@@ -24,7 +24,9 @@ public MarkupDirectiveCompilerPipeline(IAbstractTreeBuilder treeBuilder, IContro
 
         public MarkupPageMetadata Compile(DothtmlRootNode dothtmlRoot, string fileName)
         {
-            var directivesByName = dothtmlRoot.Directives.GroupBy(d => d.Name, StringComparer.OrdinalIgnoreCase).ToDictionary(d => d.Key, d => (IReadOnlyList<DothtmlDirectiveNode>)d.ToList());
+            var directivesByName = dothtmlRoot.Directives
+                .GroupBy(d => d.Name, StringComparer.OrdinalIgnoreCase)
+                .ToDictionary(d => d.Key, d => (IReadOnlyList<DothtmlDirectiveNode>)d.ToList(), StringComparer.OrdinalIgnoreCase);
 
             var resolvedDirectives = new Dictionary<string, IReadOnlyList<IAbstractDirective>>();
 
diff --git a/src/Tests/Runtime/ControlTree/DefaultControlTreeResolver/ViewModelDirectiveTest.cs b/src/Tests/Runtime/ControlTree/DefaultControlTreeResolver/ViewModelDirectiveTest.cs
index fe9297ba56..4176eb21b9 100644
--- a/src/Tests/Runtime/ControlTree/DefaultControlTreeResolver/ViewModelDirectiveTest.cs
+++ b/src/Tests/Runtime/ControlTree/DefaultControlTreeResolver/ViewModelDirectiveTest.cs
@@ -88,5 +88,16 @@ public void ResolvedTree_ViewModel_TypeFromGlobalImportedNamespace()
             Assert.IsFalse(root.Directives.Any(d => d.Value.Any(dd => dd.DothtmlNode.HasNodeErrors)));
             Assert.AreEqual(typeof(TestViewModel), root.DataContextTypeStack.DataContextType);
         }
+
+        [TestMethod]
+        [DataRow("@viewModel")]
+        [DataRow("@viewmodel")]
+        public void ResolvedTree_ViewModel_DirectiveIdentifier_CaseInsensitivity(string directive)
+        {
+            var root = ParseSource($"{directive} System.String");
+
+            Assert.IsFalse(root.Directives.Any(d => d.Value.Any(dd => dd.DothtmlNode.HasNodeErrors)));
+            Assert.AreEqual(typeof(string), root.DataContextTypeStack.DataContextType);
+        }
     }
 }