diff --git a/src/Generator/Options.cs b/src/Generator/Options.cs
index 766fd4de..1852e536 100644
--- a/src/Generator/Options.cs
+++ b/src/Generator/Options.cs
@@ -133,7 +133,7 @@ namespace CppSharp
         public List<string> NoGenIncludeDirs;
 
         /// <summary>
-        /// Wether the generated C# code should be automatically compiled.
+        /// Whether the generated C# code should be automatically compiled.
         /// </summary>
         public bool CompileCode;
 
diff --git a/src/Generator/Passes/CleanInvalidDeclNamesPass.cs b/src/Generator/Passes/CleanInvalidDeclNamesPass.cs
index 9eb352a1..19a4c172 100644
--- a/src/Generator/Passes/CleanInvalidDeclNamesPass.cs
+++ b/src/Generator/Passes/CleanInvalidDeclNamesPass.cs
@@ -74,6 +74,17 @@ namespace CppSharp.Passes
             var ret = base.VisitClassDecl(@class);
             this.uniqueName = currentUniqueName;
 
+            if (@class.Namespace.Classes.Any(d => d != @class && d.Name == @class.Name))
+            {
+                StringBuilder str = new StringBuilder();
+                str.Append(@class.Name);
+                do
+                {
+                    str.Append('_');
+                } while (@class.Classes.Any(d => d != @class && d.Name == str.ToString()));
+                @class.Name = str.ToString();
+            }
+
             return ret;
         }
 
diff --git a/tests/Basic/Basic.h b/tests/Basic/Basic.h
index de990011..69d34e92 100644
--- a/tests/Basic/Basic.h
+++ b/tests/Basic/Basic.h
@@ -647,24 +647,24 @@ public:
         {
         };
     };
-	struct
-	{
-		struct
-		{
-		};
-	};
-	struct
-	{
-		struct
-		{
-		};
-	};
-	struct
-	{
-		struct
-		{
-		};
-	};
+    struct
+    {
+        struct
+        {
+        };
+    };
+    struct
+    {
+        struct
+        {
+        };
+    };
+    struct
+    {
+        struct
+        {
+        };
+    };
 
     union as_types
     {
@@ -728,3 +728,16 @@ public:
     bool operator ==(const DifferentConstOverloads& other);
     bool operator ==(int number) const;
 };
+
+class TestNamingAnonymousTypesInUnion
+{
+public:
+    union {
+        struct {
+        } argb;
+        struct {
+        } ahsv;
+        struct {
+        } acmyk;
+    } ct;
+};