diff --git a/src/MemoryPack.Generator/Extensions.cs b/src/MemoryPack.Generator/Extensions.cs
index c4a2de1..b9a1dad 100644
--- a/src/MemoryPack.Generator/Extensions.cs
+++ b/src/MemoryPack.Generator/Extensions.cs
@@ -291,4 +291,22 @@ public static bool ContainsConstructorParameter(this IEnumerable<MemberMeta> mem
         members.Any(x =>
             x.IsConstructorParameter &&
             string.Equals(constructorParameter.Name, x.ConstructorParameterName, StringComparison.OrdinalIgnoreCase));
+
+    public static bool TryGetConstructorMember(this IEnumerable<MemberMeta> members, IParameterSymbol constructorParameter, out MemberMeta? member)
+    {
+        member = members.FirstOrDefault(m =>
+        {
+            if (EqualsConstructorParameter(constructorParameter, m.Name)) return true;
+            if (m.Name.StartsWith(UnderScorePrefix))
+            {
+                return EqualsConstructorParameter(constructorParameter, m.Name.Substring(UnderScorePrefix.Length));
+            }
+
+            return false;
+        });
+
+        return member != null;
+
+        static bool EqualsConstructorParameter(IParameterSymbol constructorParameter, string name) => constructorParameter.Name.Equals(name, StringComparison.OrdinalIgnoreCase);
+    }
 }
diff --git a/src/MemoryPack.Generator/MemoryPackGenerator.Parser.cs b/src/MemoryPack.Generator/MemoryPackGenerator.Parser.cs
index 0806cd1..5093fcb 100644
--- a/src/MemoryPack.Generator/MemoryPackGenerator.Parser.cs
+++ b/src/MemoryPack.Generator/MemoryPackGenerator.Parser.cs
@@ -104,9 +104,21 @@ public TypeMeta(INamedTypeSymbol symbol, ReferenceSymbols reference)
                 }
                 return true;
             })
-            .Select((x, i) => new MemberMeta(x, Constructor, reference, i))
+            .Select((x, i) => new MemberMeta(x, reference, i))
             .OrderBy(x => x.Order)
-            .ToArray();
+            .ToArray();
+
+        if (this.Constructor != null)
+        {
+            foreach (var parameter in this.Constructor.Parameters)
+            {
+                if (this.Members.TryGetConstructorMember(parameter, out var member))
+                {
+                    member!.IsConstructorParameter = true;
+                    member!.ConstructorParameterName = parameter.Name;
+                }
+            }
+        }
 
         this.IsValueType = symbol.IsValueType;
         this.IsUnmanagedType = symbol.IsUnmanagedType;
@@ -621,8 +633,8 @@ partial class MemberMeta
     public bool IsProperty { get; }
     public bool IsSettable { get; }
     public bool IsAssignable { get; }
-    public bool IsConstructorParameter { get; }
-    public string? ConstructorParameterName { get; }
+    public bool IsConstructorParameter { get; set; }
+    public string? ConstructorParameterName { get; set; }
     public int Order { get; }
     public bool HasExplicitOrder { get; }
     public MemberKind Kind { get; }
@@ -637,7 +649,7 @@ partial class MemberMeta
         this.Kind = MemberKind.Blank;
     }
 
-    public MemberMeta(ISymbol symbol, IMethodSymbol? constructor, ReferenceSymbols references, int sequentialOrder)
+    public MemberMeta(ISymbol symbol, ReferenceSymbols references, int sequentialOrder)
     {
         this.Symbol = symbol;
         this.Name = symbol.Name;
@@ -655,16 +667,6 @@ public MemberMeta(ISymbol symbol, IMethodSymbol? constructor, ReferenceSymbols r
             this.HasExplicitOrder = false;
         }
 
-        if (constructor != null)
-        {
-            this.IsConstructorParameter = constructor.TryGetConstructorParameter(symbol, out var constructorParameter);
-            this.ConstructorParameterName = constructorParameter?.Name;
-        }
-        else
-        {
-            this.IsConstructorParameter = false;
-        }
-
         if (symbol is IFieldSymbol f)
         {
             IsProperty = false;