diff --git a/LLama/LLamaStatelessExecutor.cs b/LLama/LLamaStatelessExecutor.cs
index a16995ba..087d2819 100644
--- a/LLama/LLamaStatelessExecutor.cs
+++ b/LLama/LLamaStatelessExecutor.cs
@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.CompilerServices;
+using System.Text;
 using System.Threading;
 using LLama.Exceptions;
 using LLama.Native;
diff --git a/LLama/Native/NativeApi.LLava.cs b/LLama/Native/NativeApi.LLava.cs
index e3aeef4b..183f183a 100644
--- a/LLama/Native/NativeApi.LLava.cs
+++ b/LLama/Native/NativeApi.LLava.cs
@@ -13,6 +13,7 @@ public static unsafe partial class NativeApi
     /// <param name="ctxClip">Llava Model</param>
     /// <returns>True if validate successfully</returns>
     [DllImport(llavaLibraryName, EntryPoint = "llava_validate_embed_size", CallingConvention = CallingConvention.Cdecl)]
+    [return: MarshalAs(UnmanagedType.U1)]
     public static extern bool llava_validate_embed_size( SafeLLamaContextHandle ctxLlama, SafeLlavaModelHandle ctxClip);
 
     /// <summary>
@@ -56,7 +57,7 @@ public static unsafe partial class NativeApi
     /// <param name="embed">Embedding handle</param>
     /// <returns>True on success</returns>
     [DllImport(llavaLibraryName, EntryPoint = "llava_eval_image_embed", CallingConvention = CallingConvention.Cdecl)]
-    public static extern bool llava_eval_image_embed(SafeLLamaContextHandle ctx_llama, SafeLlavaImageEmbedHandle embed,
-        int n_batch, ref int n_past);
+    [return: MarshalAs(UnmanagedType.U1)]
+    public static extern bool llava_eval_image_embed(SafeLLamaContextHandle ctx_llama, SafeLlavaImageEmbedHandle embed, int n_batch, ref int n_past);
     
 }
\ No newline at end of file
diff --git a/LLama/Native/NativeApi.cs b/LLama/Native/NativeApi.cs
index 309e12d5..11a8690f 100644
--- a/LLama/Native/NativeApi.cs
+++ b/LLama/Native/NativeApi.cs
@@ -34,6 +34,7 @@ namespace LLama.Native
         /// </summary>
         /// <returns></returns>
         [DllImport(libraryName, CallingConvention = CallingConvention.Cdecl)]
+        [return: MarshalAs(UnmanagedType.U1)]
         public static extern bool llama_supports_mmap();
 
         /// <summary>
@@ -41,6 +42,7 @@ namespace LLama.Native
         /// </summary>
         /// <returns></returns>
         [DllImport(libraryName, CallingConvention = CallingConvention.Cdecl)]
+        [return: MarshalAs(UnmanagedType.U1)]
         public static extern bool llama_supports_mlock();
 
         /// <summary>
@@ -48,6 +50,7 @@ namespace LLama.Native
         /// </summary>
         /// <returns></returns>
         [DllImport(libraryName, CallingConvention = CallingConvention.Cdecl)]
+        [return: MarshalAs(UnmanagedType.U1)]
         public static extern bool llama_supports_gpu_offload();
 
         /// <summary>
@@ -77,6 +80,7 @@ namespace LLama.Native
         /// <param name="n_token_count_out"></param>
         /// <returns></returns>
         [DllImport(libraryName, CallingConvention = CallingConvention.Cdecl)]
+        [return: MarshalAs(UnmanagedType.U1)]
         public static extern bool llama_state_load_file(SafeLLamaContextHandle ctx, string path_session, LLamaToken[] tokens_out, ulong n_token_capacity, out ulong n_token_count_out);
 
         /// <summary>
@@ -88,6 +92,7 @@ namespace LLama.Native
         /// <param name="n_token_count"></param>
         /// <returns></returns>
         [DllImport(libraryName, CallingConvention = CallingConvention.Cdecl)]
+        [return: MarshalAs(UnmanagedType.U1)]
         public static extern bool llama_state_save_file(SafeLLamaContextHandle ctx, string path_session, LLamaToken[] tokens, ulong n_token_count);
 
         [DllImport(libraryName, CallingConvention = CallingConvention.Cdecl)]
@@ -284,6 +289,7 @@ namespace LLama.Native
         /// <param name="p1"></param>
         /// <returns>Returns false if a partial sequence cannot be removed. Removing a whole sequence never fails</returns>
         [DllImport(libraryName, CallingConvention = CallingConvention.Cdecl)]
+        [return: MarshalAs(UnmanagedType.U1)]
         public static extern bool llama_kv_cache_seq_rm(SafeLLamaContextHandle ctx, LLamaSeqId seq, LLamaPos p0, LLamaPos p1);
 
         /// <summary>
diff --git a/LLama/Native/SafeLlamaModelHandle.cs b/LLama/Native/SafeLlamaModelHandle.cs
index e55902bc..f24cfe5f 100644
--- a/LLama/Native/SafeLlamaModelHandle.cs
+++ b/LLama/Native/SafeLlamaModelHandle.cs
@@ -369,6 +369,7 @@ namespace LLama.Native
         /// <param name="token"></param>
         /// <returns></returns>
         [DllImport(NativeApi.libraryName, CallingConvention = CallingConvention.Cdecl)]
+        [return: MarshalAs(UnmanagedType.U1)]
         private static extern bool llama_token_is_eog(SafeLlamaModelHandle model, LLamaToken token);
         #endregion