diff --git a/decompiler/frontend/binaryninja/handlers/types.py b/decompiler/frontend/binaryninja/handlers/types.py
index 5b0305b1..929162a7 100644
--- a/decompiler/frontend/binaryninja/handlers/types.py
+++ b/decompiler/frontend/binaryninja/handlers/types.py
@@ -1,6 +1,6 @@
 import logging
 from abc import abstractmethod
-from typing import Union
+from typing import Optional, Union
 
 from binaryninja import BinaryView, StructureVariant
 from binaryninja.types import (
@@ -22,7 +22,7 @@
 )
 from decompiler.frontend.lifter import Handler
 from decompiler.structures.pseudo import ArrayType as PseudoArrayType
-from decompiler.structures.pseudo import CustomType, Float, FunctionTypeDef, Integer, Pointer, UnknownType
+from decompiler.structures.pseudo import CustomType, Float, FunctionTypeDef, Integer, Pointer, UnknownType, Variable
 from decompiler.structures.pseudo.complextypes import Class, ComplexTypeMember, ComplexTypeName, Enum, Struct
 from decompiler.structures.pseudo.complextypes import Union as Union_
 
@@ -101,25 +101,21 @@ def lift_struct(self, struct: StructureType, name: str = None, **kwargs) -> Unio
             return cached_type
 
         """Lift struct or union type."""
-        match struct.type:
-            case StructureVariant.StructStructureType:
-                keyword, type, to_members = "struct", Struct, lambda members: {m.offset: m for m in members}
-            case StructureVariant.UnionStructureType:
-                keyword, type, to_members = "union", Union_, lambda members: members
-            case StructureVariant.ClassStructureType:
-                keyword, type, to_members = "class", Class, lambda members: members
-            case _:
-                raise RuntimeError(f"Unknown struct type {struct.type.name}")
+        if struct.type == StructureVariant.StructStructureType:
+            keyword, type, members = "struct", Struct, {}
+        elif struct.type == StructureVariant.UnionStructureType:
+            keyword, type, members = "union", Union_, []
+        elif struct.type == StructureVariant.ClassStructureType:
+            keyword, type, members = "class", Class, {}
+        else:
+            raise RuntimeError(f"Unknown struct type {struct.type.name}")
 
         type_name = self._get_data_type_name(struct, keyword=keyword, provided_name=name)
-
-        members: list[ComplexTypeMember] = []
-        for member in struct.members:
-            members.append(self.lift_struct_member(member, type_name))
-
-        lifted_struct = type(struct.width * self.BYTE_SIZE, type_name, to_members(members))
+        lifted_struct = type(struct.width * self.BYTE_SIZE, type_name, members)
 
         self._lifter.complex_types.add(lifted_struct, type_id)
+        for member in struct.members:
+            lifted_struct.add_member(self.lift_struct_member(member, type_name))
         return lifted_struct
 
     @abstractmethod
diff --git a/decompiler/structures/pseudo/complextypes.py b/decompiler/structures/pseudo/complextypes.py
index 61e86353..3c304053 100644
--- a/decompiler/structures/pseudo/complextypes.py
+++ b/decompiler/structures/pseudo/complextypes.py
@@ -4,7 +4,6 @@
 from typing import Dict, List, Optional
 
 from decompiler.structures.pseudo.typing import Type
-from pydot import frozendict
 
 
 class ComplexTypeSpecifier(Enum):
@@ -58,9 +57,12 @@ def declaration(self) -> str:
 class _BaseStruct(ComplexType):
     """Class representing a struct type."""
 
-    members: frozendict[int, ComplexTypeMember] = field(compare=False)
+    members: Dict[int, ComplexTypeMember] = field(compare=False)
     type_specifier: ComplexTypeSpecifier
 
+    def add_member(self, member: ComplexTypeMember):
+        self.members[member.offset] = member
+
     def get_member_by_offset(self, offset: int) -> Optional[ComplexTypeMember]:
         return self.members.get(offset)
 
@@ -93,6 +95,9 @@ class Union(ComplexType):
     members: List[ComplexTypeMember] = field(compare=False)
     type_specifier = ComplexTypeSpecifier.UNION
 
+    def add_member(self, member: ComplexTypeMember):
+        self.members.append(member)
+
     def declaration(self) -> str:
         members = ";\n\t".join(x.declaration() for x in self.members) + ";"
         return f"{self.type_specifier.value} {self.name} {{\n\t{members}\n}}"
@@ -118,6 +123,9 @@ class Enum(ComplexType):
     members: Dict[int, ComplexTypeMember] = field(compare=False)
     type_specifier = ComplexTypeSpecifier.ENUM
 
+    def add_member(self, member: ComplexTypeMember):
+        self.members[member.value] = member
+
     def get_name_by_value(self, value: int) -> Optional[str]:
         member = self.members.get(value)
         return member.name if member is not None else None
diff --git a/tests/structures/pseudo/test_complextypes.py b/tests/structures/pseudo/test_complextypes.py
index 3fc0b970..7b09e82b 100644
--- a/tests/structures/pseudo/test_complextypes.py
+++ b/tests/structures/pseudo/test_complextypes.py
@@ -11,7 +11,6 @@
     Union,
     UniqueNameProvider,
 )
-from pydot import frozendict
 
 
 class TestStruct:
@@ -61,17 +60,11 @@ def test_get_complex_type_name(self, book):
 
 
 class TestClass:
-    def test_declaration(self, record_id: Union):
-        m = ComplexTypeMember(size=64, name="id", offset=12, type=record_id)
-        class_book = Struct(
-            name="Book",
-            members=frozendict({
-                0: ComplexTypeMember(size=32, name="title", offset=0, type=Pointer(Integer.char())),
-                4: ComplexTypeMember(size=32, name="num_pages", offset=4, type=Integer.int32_t()),
-                8: ComplexTypeMember(size=32, name="author", offset=8, type=Pointer(Integer.char())),
-                12: m
-            }),
-            size=96,
+    def test_declaration(self, class_book: Struct, record_id: Union):
+        assert class_book.declaration() == "class ClassBook {\n\tchar * title;\n\tint num_pages;\n\tchar * author;\n}"
+        # nest complex type
+        class_book.add_member(
+            m := ComplexTypeMember(size=64, name="id", offset=12, type=record_id),
         )
         result = f"class ClassBook {{\n\tchar * title;\n\tint num_pages;\n\tchar * author;\n\t{m.declaration()};\n}}"
         assert class_book.declaration() == result