diff --git a/src/CppParser/Parser.cpp b/src/CppParser/Parser.cpp
index 14c8c90d..5e847425 100644
--- a/src/CppParser/Parser.cpp
+++ b/src/CppParser/Parser.cpp
@@ -2216,7 +2216,7 @@ void Parser::WalkFunction(clang::FunctionDecl* FD, Function* F,
         P->Index = VD->getFunctionScopeIndex();
         if (VD->hasDefaultArg() && !VD->hasUnparsedDefaultArg() && !VD->hasUninstantiatedDefaultArg())
         {
-            P->DefaultArgument = WalkStatement(VD->getDefaultArg());
+            P->DefaultArgument = WalkExpression(VD->getDefaultArg());
         }
         HandleDeclaration(VD, P);
 
@@ -2493,17 +2493,17 @@ void Parser::HandlePreprocessedEntities(Declaration* Decl)
     }
 }
 
-AST::Expression* Parser::WalkStatement(clang::Stmt* Statement)
+AST::Expression* Parser::WalkExpression(clang::Expr* Expr)
 {
     using namespace clang;
 
-    switch (Statement->getStmtClass())
+    switch (Expr->getStmtClass())
     {
     case Stmt::BinaryOperatorClass:
-        return new AST::Expression(GetStringFromStatement(Statement), StatementClass::BinaryOperator);
+        return new AST::Expression(GetStringFromStatement(Expr), StatementClass::BinaryOperator);
     case Stmt::DeclRefExprClass:
-        return new AST::Expression(GetStringFromStatement(Statement), StatementClass::DeclRefExprClass,
-            WalkDeclaration(cast<DeclRefExpr>(Statement)->getDecl()));
+        return new AST::Expression(GetStringFromStatement(Expr), StatementClass::DeclRefExprClass,
+            WalkDeclaration(cast<DeclRefExpr>(Expr)->getDecl()));
     case Stmt::CStyleCastExprClass:
     case Stmt::CXXConstCastExprClass:
     case Stmt::CXXDynamicCastExprClass:
@@ -2511,14 +2511,14 @@ AST::Expression* Parser::WalkStatement(clang::Stmt* Statement)
     case Stmt::CXXReinterpretCastExprClass:
     case Stmt::CXXStaticCastExprClass:
     case Stmt::ImplicitCastExprClass:
-        return WalkStatement(cast<CastExpr>(Statement)->getSubExprAsWritten());
+        return WalkExpression(cast<CastExpr>(Expr)->getSubExprAsWritten());
     case Stmt::CXXOperatorCallExprClass:
-        return new AST::Expression(GetStringFromStatement(Statement), StatementClass::CXXOperatorCallExpr,
-            WalkDeclaration(cast<CXXOperatorCallExpr>(Statement)->getCalleeDecl()));
+        return new AST::Expression(GetStringFromStatement(Expr), StatementClass::CXXOperatorCallExpr,
+            WalkDeclaration(cast<CXXOperatorCallExpr>(Expr)->getCalleeDecl()));
     case Stmt::CXXConstructExprClass:
     case Stmt::CXXTemporaryObjectExprClass:
     {
-        auto ConstructorExpr = cast<CXXConstructExpr>(Statement);
+        auto ConstructorExpr = cast<CXXConstructExpr>(Expr);
         if (ConstructorExpr->getNumArgs() == 1)
         {
             auto Arg = ConstructorExpr->getArg(0);
@@ -2527,18 +2527,23 @@ AST::Expression* Parser::WalkStatement(clang::Stmt* Statement)
             {
                 auto Cast = dyn_cast<CastExpr>(TemporaryExpr->GetTemporaryExpr());
                 if (Cast && Cast->getSubExprAsWritten()->getStmtClass() != Stmt::IntegerLiteralClass)
-                    return WalkStatement(Cast->getSubExprAsWritten());
+                    return WalkExpression(Cast->getSubExprAsWritten());
             }
         }
-        return new AST::Expression(GetStringFromStatement(Statement), StatementClass::CXXConstructExprClass,
+        return new AST::Expression(GetStringFromStatement(Expr), StatementClass::CXXConstructExprClass,
             WalkDeclaration(ConstructorExpr->getConstructor()));
     }
     case Stmt::MaterializeTemporaryExprClass:
-        return WalkStatement(cast<MaterializeTemporaryExpr>(Statement)->GetTemporaryExpr());
+        return WalkExpression(cast<MaterializeTemporaryExpr>(Expr)->GetTemporaryExpr());
     default:
         break;
     }
-    return new AST::Expression(GetStringFromStatement(Statement));
+    llvm::APSInt integer;
+    if (Expr->getStmtClass() != Stmt::CharacterLiteralClass &&
+        Expr->getStmtClass() != Stmt::CXXBoolLiteralExprClass &&
+        Expr->EvaluateAsInt(integer, C->getASTContext()))
+        return new AST::Expression(integer.toString(10));
+    return new AST::Expression(GetStringFromStatement(Expr));
 }
 
 std::string Parser::GetStringFromStatement(const clang::Stmt* Statement)
diff --git a/src/CppParser/Parser.h b/src/CppParser/Parser.h
index 78c3495e..43a32620 100644
--- a/src/CppParser/Parser.h
+++ b/src/CppParser/Parser.h
@@ -97,7 +97,7 @@ protected:
     VTableComponent WalkVTableComponent(const clang::VTableComponent& Component);
     PreprocessedEntity* WalkPreprocessedEntity(Declaration* Decl,
         clang::PreprocessedEntity* PPEntity);
-    AST::Expression* WalkStatement(clang::Stmt* Statement);
+    AST::Expression* WalkExpression(clang::Expr* Expression);
     std::string GetStringFromStatement(const clang::Stmt* Statement);
 
     // Clang helpers
diff --git a/src/Generator/Passes/HandleDefaultParamValuesPass.cs b/src/Generator/Passes/HandleDefaultParamValuesPass.cs
index d547e2d6..6901bae7 100644
--- a/src/Generator/Passes/HandleDefaultParamValuesPass.cs
+++ b/src/Generator/Passes/HandleDefaultParamValuesPass.cs
@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.Globalization;
 using System.Linq;
 using System.Text.RegularExpressions;
 using CppSharp.AST;
@@ -43,8 +42,6 @@ namespace CppSharp.Passes
                 if (CheckForEnumValue(parameter, desugared))
                     continue;
 
-                CheckForULongValue(parameter, desugared);
-
                 CheckForDefaultEmptyChar(parameter, desugared);
             }
 
@@ -139,17 +136,6 @@ namespace CppSharp.Passes
             return false;
         }
 
-        private static void CheckForULongValue(Parameter parameter, Type desugared)
-        {
-            ulong value;
-            string @default = parameter.DefaultArgument.String;
-            // HACK: .NET's Parse/TryParse have a bug preventing them from parsing UL-suffixed ulongs
-            if (desugared.IsPrimitiveType() && @default.EndsWith("UL"))
-                @default = @default.Substring(0, @default.Length - 2);
-            if (ulong.TryParse(@default, out value))
-                parameter.DefaultArgument.String = value.ToString(CultureInfo.InvariantCulture);
-        }
-
         private void CheckForDefaultEmptyChar(Parameter parameter, Type desugared)
         {
             if (parameter.DefaultArgument.String == "0" && Driver.Options.MarshalCharAsManagedChar &&
diff --git a/tests/CSharpTemp/CSharpTemp.cpp b/tests/CSharpTemp/CSharpTemp.cpp
index 67238c47..576218e2 100644
--- a/tests/CSharpTemp/CSharpTemp.cpp
+++ b/tests/CSharpTemp/CSharpTemp.cpp
@@ -285,6 +285,10 @@ void MethodsWithDefaultValues::defaultMappedToEnum(QFlags<Flags> qFlags)
 {
 }
 
+void MethodsWithDefaultValues::defaultIntWithLongExpression(unsigned int i)
+{
+}
+
 void HasPrivateOverrideBase::privateOverride(int i)
 {
 }
@@ -301,4 +305,4 @@ IgnoredType<int> PropertyWithIgnoredType::ignoredType()
 void PropertyWithIgnoredType::setIgnoredType(const IgnoredType<int> &value)
 {
     _ignoredType = value;
-}
\ No newline at end of file
+}
diff --git a/tests/CSharpTemp/CSharpTemp.h b/tests/CSharpTemp/CSharpTemp.h
index 969ea700..cbbfbfda 100644
--- a/tests/CSharpTemp/CSharpTemp.h
+++ b/tests/CSharpTemp/CSharpTemp.h
@@ -212,6 +212,8 @@ private:
     const char* _name;
 };
 
+#define DEFAULT_INT (2 * 1000UL + 500UL)
+
 class DLL_API MethodsWithDefaultValues
 {
 public:
@@ -231,6 +233,7 @@ public:
     void defaultEnumAssignedBitwiseOrShort(UntypedFlags flags = Flag1 | Flag2);
     void defaultNonEmptyCtor(QGenericArgument arg = QGenericArgument(0));
     void defaultMappedToEnum(QFlags<Flags> qFlags = Flags::Flag1);
+    void defaultIntWithLongExpression(unsigned int i = DEFAULT_INT);
 };
 
 class DLL_API HasPrivateOverrideBase