diff --git a/src/api/dotnet/Context.cs b/src/api/dotnet/Context.cs
index e63f86ca0..d40281a81 100644
--- a/src/api/dotnet/Context.cs
+++ b/src/api/dotnet/Context.cs
@@ -156,11 +156,11 @@ namespace Microsoft.Z3
         /// <summary>
         /// Retrieves the String sort of the context.
         /// </summary>
-        public SeqSort CharSort
+        public CharSort CharSort
         {
             get
             {
-                if (m_charSort == null) m_charSort = new CharSort(this, Native.Z3_mk_char_sort(nCtx)); return m_charSort;
+                if (m_charSort == null) m_charSort = new CharSort(this); return m_charSort;
             }
         }
 
diff --git a/src/api/dotnet/SeqSort.cs b/src/api/dotnet/SeqSort.cs
index 2902b1e9e..ae57885ca 100644
--- a/src/api/dotnet/SeqSort.cs
+++ b/src/api/dotnet/SeqSort.cs
@@ -33,11 +33,6 @@ namespace Microsoft.Z3
         {
             Debug.Assert(ctx != null);
         }
-        internal SeqSort(Context ctx)
-            : base(ctx, Native.Z3_mk_int_sort(ctx.nCtx))
-        {
-            Debug.Assert(ctx != null);
-        }
         #endregion
     }
 }