diff --git a/libs/langchain-ollama/src/embeddings.ts b/libs/langchain-ollama/src/embeddings.ts
index a2075b501c98..43ddaadacccf 100644
--- a/libs/langchain-ollama/src/embeddings.ts
+++ b/libs/langchain-ollama/src/embeddings.ts
@@ -35,7 +35,7 @@ interface OllamaEmbeddingsParams extends EmbeddingsParams {
   /**
    * Optional HTTP Headers to include in the request.
    */
-  headers?: Record<string, string>;
+  headers?: Headers | Record<string, string>;
 
   /**
    * Advanced Ollama API request parameters in camelCase, see
@@ -63,7 +63,7 @@ export class OllamaEmbeddings extends Embeddings {
 
     this.client = new Ollama({
       host: fields?.baseUrl,
-      headers: fields?.headers,
+      headers: fields?.headers ? new Headers(fields.headers) : undefined,
     });
     this.baseUrl = fields?.baseUrl ?? this.baseUrl;