diff --git a/src/Kiota.Builder/Refiners/CommonLanguageRefiner.cs b/src/Kiota.Builder/Refiners/CommonLanguageRefiner.cs
index 0e725475c2..6b8f9aee1e 100644
--- a/src/Kiota.Builder/Refiners/CommonLanguageRefiner.cs
+++ b/src/Kiota.Builder/Refiners/CommonLanguageRefiner.cs
@@ -479,6 +479,8 @@ private static CodeTypeBase ConvertComposedTypeToWrapper(CodeClass codeClass, Co
         if (!supportsInnerClasses)
         {
             var @namespace = codeClass.GetImmediateParentOfType<CodeNamespace>();
+            if (@namespace.FindChildByName<CodeClass>(codeComposedType.Name, false) is not null)
+                codeComposedType.Name = $"{codeComposedType.Name}Wrapper";
             newClass = @namespace.AddClass(new CodeClass
             {
                 Name = codeComposedType.Name,
diff --git a/tests/Kiota.Builder.Tests/Refiners/PhpLanguageRefinerTests.cs b/tests/Kiota.Builder.Tests/Refiners/PhpLanguageRefinerTests.cs
index 943a730ab2..9f5f755d91 100644
--- a/tests/Kiota.Builder.Tests/Refiners/PhpLanguageRefinerTests.cs
+++ b/tests/Kiota.Builder.Tests/Refiners/PhpLanguageRefinerTests.cs
@@ -235,4 +235,31 @@ public async Task ImportsClassForDiscriminatorReturns()
         await ILanguageRefiner.Refine(new GenerationConfiguration { Language = GenerationLanguage.PHP }, root);
         Assert.Equal(2, modelClass.Usings.Count());
     }
+
+    [Fact]
+    public async Task RenamesComposedTypeWrapperWhenSimilarClassExistsInNamespace()
+    {
+        var model = new CodeClass
+        {
+            Name = "Union",
+            Kind = CodeClassKind.Model
+        };
+        var parent = new CodeClass
+        {
+            Name = "Parent"
+        };
+        root.AddClass(model, parent);
+        
+        var composedType = new CodeUnionType { Name = "Union" };
+        composedType.AddType(new CodeType { Name = "string" }, new CodeType { Name = "int"});
+        
+        var composedProperty = parent.AddProperty(new CodeProperty
+        {
+            Name = "property",
+            Type = composedType
+        }).First();
+        
+        await ILanguageRefiner.Refine(new GenerationConfiguration { Language = GenerationLanguage.PHP }, root);
+        Assert.NotNull(root.FindChildByName<CodeClass>("UnionWrapper", false));
+    }
 }