diff --git a/TestSuite/errors/err0371_static_predefinition.pas b/TestSuite/errors/err0371_static_predefinition.pas
new file mode 100644
index 000000000..20e82b096
--- /dev/null
+++ b/TestSuite/errors/err0371_static_predefinition.pas
@@ -0,0 +1,13 @@
+// #2266
+type
+  T1 = class;
+  
+  {T2 = class
+    tt: T1;
+  end;}
+  
+  T1 = static class
+    //public static a: integer;
+  end;
+begin
+end.
\ No newline at end of file
diff --git a/TreeConverter/TreeConversion/syntax_tree_visitor.cs b/TreeConverter/TreeConversion/syntax_tree_visitor.cs
index 59a06a58f..a7ceb1829 100644
--- a/TreeConverter/TreeConversion/syntax_tree_visitor.cs
+++ b/TreeConverter/TreeConversion/syntax_tree_visitor.cs
@@ -11536,6 +11536,15 @@ namespace PascalABCCompiler.TreeConverter
             //bool is_template_synonym = false;
             //SyntaxTree.array_type at=_type_declaration.type_def as SyntaxTree.array_type;
             
+            if (_type_declaration.type_def is class_definition cd && cd.keyword == class_keyword.Class && 
+                (cd.attribute & SyntaxTree.class_attribute.Static) == SyntaxTree.class_attribute.Static)
+            {
+                var name = _type_declaration.type_name.name.ToLower();
+                if(context.types_predefined.Select(tn => tn.name.ToLower()).Contains(name))
+                    AddError(get_location(_type_declaration), "STATIC_CLASS_CANNOT_HAVE_PREDEFINITION"); // #2266
+            }
+
+
             template_class tc = null;
             SyntaxTree.template_type_name ttn = _type_declaration.type_name as SyntaxTree.template_type_name;
             SyntaxTree.class_definition cl_def = _type_declaration.type_def as SyntaxTree.class_definition;
diff --git a/bin/Lng/Eng/SemanticErrors_ms.dat b/bin/Lng/Eng/SemanticErrors_ms.dat
index 35a546dfc..6d3acbb49 100644
--- a/bin/Lng/Eng/SemanticErrors_ms.dat
+++ b/bin/Lng/Eng/SemanticErrors_ms.dat
@@ -39,4 +39,5 @@ ONE_DIM_ARRAY_OR_LIST_EXPECTED=One-dimensional array or list expected
 TUPLE_TYPE_ELEMENTS_COUNT_MUST_BE_LESSEQUAL_7=Number of elements in tuple type must be less than 8
 OVERRIDE_METHODS_CANNOT_CONTAIN_WHERE_SECTION=Methods with override modifier can't contain where section
 ������ � ������������� override �� ����� ��������� ����������� ������ where
-EXPLICIT_CASTS_FOR_LAMBDA_EXPRESSIONS_ARE_FORBIDDEN=Explicit type casts for lambda expressions are forbidden
\ No newline at end of file
+EXPLICIT_CASTS_FOR_LAMBDA_EXPRESSIONS_ARE_FORBIDDEN=Explicit type casts for lambda expressions are forbidden
+STATIC_CLASS_CANNOT_HAVE_PREDEFINITION=Static class cannot be predefined
\ No newline at end of file
diff --git a/bin/Lng/Rus/SemanticErrors_ms.dat b/bin/Lng/Rus/SemanticErrors_ms.dat
index 8b91357d9..c5d8f6fd8 100644
--- a/bin/Lng/Rus/SemanticErrors_ms.dat
+++ b/bin/Lng/Rus/SemanticErrors_ms.dat
@@ -39,4 +39,5 @@ ACCESS_TO_ENUM_CONST_THROUGH_OBJECT=Нельзя обратиться к эле
 ONE_DIM_ARRAY_OR_LIST_EXPECTED=Ожидался одномерный массив или список
 TUPLE_TYPE_ELEMENTS_COUNT_MUST_BE_LESSEQUAL_7=Количество элементов в типе кортежа не должно быть больше 7
 OVERRIDE_METHODS_CANNOT_CONTAIN_WHERE_SECTION=Методы с модификатором override не могут содержать собственную секцию where
-EXPLICIT_CASTS_FOR_LAMBDA_EXPRESSIONS_ARE_FORBIDDEN=Явные приведения типов для лямбда-выражений запрещены
\ No newline at end of file
+EXPLICIT_CASTS_FOR_LAMBDA_EXPRESSIONS_ARE_FORBIDDEN=Явные приведения типов для лямбда-выражений запрещены
+STATIC_CLASS_CANNOT_HAVE_PREDEFINITION=Статический класс не может иметь предописание
\ No newline at end of file