diff --git a/libs/langchain-community/src/vectorstores/milvus.ts b/libs/langchain-community/src/vectorstores/milvus.ts
index d8844c31c2a2..d15fe0c0b6f7 100644
--- a/libs/langchain-community/src/vectorstores/milvus.ts
+++ b/libs/langchain-community/src/vectorstores/milvus.ts
@@ -573,7 +573,7 @@ export class Milvus extends VectorStore {
     });
     desc.schema.fields.forEach((field) => {
       this.fields.push(field.name);
-      // Only remove autoID fields from this.fields if we're using autoId mode
+      // Remove autoID fields from this.fields if we're using autoId mode
       // When autoId is false, we need to include the primary field for upsert operations
       if (field.autoID && this.autoId) {
         const index = this.fields.indexOf(field.name);
@@ -581,6 +581,14 @@ export class Milvus extends VectorStore {
           this.fields.splice(index, 1);
         }
       }
+      // Remove isFunctionOutput fields from this.fields if this field is calculated on server side
+      // When isFunctionOutput is false, we need to include this field for upsert operations
+      if (field.is_function_output) {
+        const index = this.fields.indexOf(field.name);
+        if (index !== -1) {
+          this.fields.splice(index, 1);
+        }
+      }
       if (field.is_primary_key) {
         this.primaryField = field.name;
       }
diff --git a/libs/langchain-community/src/vectorstores/tests/milvus.test.ts b/libs/langchain-community/src/vectorstores/tests/milvus.test.ts
index ee3c0e86d901..38fdc4c607f5 100644
--- a/libs/langchain-community/src/vectorstores/tests/milvus.test.ts
+++ b/libs/langchain-community/src/vectorstores/tests/milvus.test.ts
@@ -10,27 +10,38 @@ const fields = [
   {
     name: "id",
     is_primary_key: true,
+    is_function_output: false,
     autoID: true,
     data_type: 21,
   },
   {
     name: "text",
     is_primary_key: false,
+    is_function_output: false,
     autoID: false,
     data_type: 21,
   },
   {
     name: "vector",
     is_primary_key: false,
+    is_function_output: false,
     autoID: false,
     data_type: 101,
   },
   {
     name: "custom_field",
     is_primary_key: false,
+    is_function_output: false,
     autoID: false,
     data_type: 21,
   },
+  {
+    name: "vector_calculated",
+    is_primary_key: false,
+    is_function_output: true,
+    autoID: false,
+    data_type: 104,
+  },
 ];
 
 // Mock successful responses