diff --git a/moxin-backend/src/backend_impls/api_server.rs b/moxin-backend/src/backend_impls/api_server.rs
index 83d3b825..1352c563 100644
--- a/moxin-backend/src/backend_impls/api_server.rs
+++ b/moxin-backend/src/backend_impls/api_server.rs
@@ -35,7 +35,7 @@ fn create_wasi(
     load_model: &LoadModelOptions,
 ) -> wasmedge_sdk::WasmEdgeResult<WasiModule> {
     // use model metadata context size
-    let ctx_size = Some(format!("{}", file.context_size));
+    let ctx_size = Some(format!("{}", file.context_size.min(8 * 1024)));
 
     let n_gpu_layers = match load_model.gpu_layers {
         moxin_protocol::protocol::GPULayers::Specific(n) => Some(n.to_string()),