diff --git a/slither/utils/code_generation.py b/slither/utils/code_generation.py
index 951bf4702..ae03e2090 100644
--- a/slither/utils/code_generation.py
+++ b/slither/utils/code_generation.py
@@ -2,12 +2,14 @@
 from typing import TYPE_CHECKING, Optional
 
 from slither.utils.type import convert_type_for_solidity_signature_to_string
+from slither.core.solidity_types.user_defined_type import UserDefinedType
+from slither.core.declarations import Structure, Enum
 
 if TYPE_CHECKING:
-    from slither.core.declarations import FunctionContract, Structure, Contract
+    from slither.core.declarations import FunctionContract, Contract, CustomErrorContract
 
 
-def generate_interface(contract: "Contract") -> str:
+def generate_interface(contract: "Contract", unroll_structs: bool = True) -> str:
     """
     Generates code for a Solidity interface to the contract.
     Args:
@@ -22,13 +24,7 @@ def generate_interface(contract: "Contract") -> str:
         name, args = event.signature
         interface += f"    event {name}({', '.join(args)});\n"
     for error in contract.custom_errors:
-        args = [
-            convert_type_for_solidity_signature_to_string(arg.type)
-            .replace("(", "")
-            .replace(")", "")
-            for arg in error.parameters
-        ]
-        interface += f"    error {error.name}({', '.join(args)});\n"
+        interface += generate_custom_error_interface(error, unroll_structs)
     for enum in contract.enums:
         interface += f"    enum {enum.name} {{ {', '.join(enum.values)} }}\n"
     for struct in contract.structures:
@@ -38,12 +34,16 @@ def generate_interface(contract: "Contract") -> str:
     for func in contract.functions_entry_points:
         if func.is_constructor or func.is_fallback or func.is_receive:
             continue
-        interface += f"    function {generate_interface_function_signature(func)};\n"
+        interface += (
+            f"    function {generate_interface_function_signature(func, unroll_structs)};\n"
+        )
     interface += "}\n\n"
     return interface
 
 
-def generate_interface_function_signature(func: "FunctionContract") -> Optional[str]:
+def generate_interface_function_signature(
+    func: "FunctionContract", unroll_structs: bool = True
+) -> Optional[str]:
     """
     Generates a string of the form:
         func_name(type1,type2) external {payable/view/pure} returns (type3)
@@ -56,7 +56,7 @@ def generate_interface_function_signature(func: "FunctionContract") -> Optional[
         Returns None if the function is private or internal, or is a constructor/fallback/receive.
     """
 
-    name, parameters, return_vars = func.signature
+    name, _, _ = func.signature
     if (
         func not in func.contract.functions_entry_points
         or func.is_constructor
@@ -69,16 +69,24 @@ def generate_interface_function_signature(func: "FunctionContract") -> Optional[
     payable = " payable" if func.payable else ""
     returns = [
         convert_type_for_solidity_signature_to_string(ret.type).replace("(", "").replace(")", "")
+        if unroll_structs
+        else f"{str(ret.type.type)} memory"
+        if isinstance(ret.type, UserDefinedType) and isinstance(ret.type.type, (Structure, Enum))
+        else str(ret.type)
         for ret in func.returns
     ]
     parameters = [
         convert_type_for_solidity_signature_to_string(param.type).replace("(", "").replace(")", "")
+        if unroll_structs
+        else f"{str(param.type.type)} memory"
+        if isinstance(param.type, UserDefinedType) and isinstance(param.type.type, (Structure, Enum))
+        else str(param.type)
         for param in func.parameters
     ]
     _interface_signature_str = (
         name + "(" + ",".join(parameters) + ") external" + payable + pure + view
     )
-    if len(return_vars) > 0:
+    if len(returns) > 0:
         _interface_signature_str += " returns (" + ",".join(returns) + ")"
     return _interface_signature_str
 
@@ -102,3 +110,17 @@ def generate_struct_interface_str(struct: "Structure") -> str:
         definition += f"        {elem.type} {elem.name};\n"
     definition += "    }\n"
     return definition
+
+
+def generate_custom_error_interface(error: "CustomErrorContract", unroll_structs: bool = True) -> str:
+    args = [
+        convert_type_for_solidity_signature_to_string(arg.type)
+        .replace("(", "")
+        .replace(")", "")
+        if unroll_structs
+        else str(arg.type.type)
+        if isinstance(arg.type, UserDefinedType) and isinstance(arg.type.type, (Structure, Enum))
+        else str(arg.type)
+        for arg in error.parameters
+    ]
+    return f"    error {error.name}({', '.join(args)});\n"