diff --git a/libs/langchain-ollama/src/chat_models.ts b/libs/langchain-ollama/src/chat_models.ts
index 4bb1c7a1a4e7..1eeb745f5bba 100644
--- a/libs/langchain-ollama/src/chat_models.ts
+++ b/libs/langchain-ollama/src/chat_models.ts
@@ -455,7 +455,7 @@ export class ChatOllama
 
   format?: string;
 
-  keepAlive?: string | number = "5m";
+  keepAlive?: string | number;
 
   client: Ollama;
 
@@ -504,7 +504,7 @@ export class ChatOllama
     this.penalizeNewline = fields?.penalizeNewline;
     this.streaming = fields?.streaming;
     this.format = fields?.format;
-    this.keepAlive = fields?.keepAlive ?? this.keepAlive;
+    this.keepAlive = fields?.keepAlive;
     this.checkOrPullModel = fields?.checkOrPullModel ?? this.checkOrPullModel;
   }
 
diff --git a/libs/langchain-ollama/src/embeddings.ts b/libs/langchain-ollama/src/embeddings.ts
index f330bb8c9580..8271ac525147 100644
--- a/libs/langchain-ollama/src/embeddings.ts
+++ b/libs/langchain-ollama/src/embeddings.ts
@@ -50,7 +50,7 @@ export class OllamaEmbeddings extends Embeddings {
 
   baseUrl = "http://localhost:11434";
 
-  keepAlive: string | number = "5m";
+  keepAlive?: string | number;
 
   requestOptions?: Partial<OllamaOptions>;
 
@@ -68,7 +68,7 @@ export class OllamaEmbeddings extends Embeddings {
     this.baseUrl = fields?.baseUrl ?? this.baseUrl;
 
     this.model = fields?.model ?? this.model;
-    this.keepAlive = fields?.keepAlive ?? this.keepAlive;
+    this.keepAlive = fields?.keepAlive;
     this.truncate = fields?.truncate ?? this.truncate;
     this.requestOptions = fields?.requestOptions
       ? this._convertOptions(fields?.requestOptions)
diff --git a/libs/langchain-ollama/src/llms.ts b/libs/langchain-ollama/src/llms.ts
index b560bc4682ff..2b1449ef0179 100644
--- a/libs/langchain-ollama/src/llms.ts
+++ b/libs/langchain-ollama/src/llms.ts
@@ -66,7 +66,7 @@ export class Ollama extends LLM<OllamaCallOptions> implements OllamaInput {
 
   baseUrl = "http://localhost:11434";
 
-  keepAlive: string | number = "5m";
+  keepAlive?: string | number;
 
   embeddingOnly?: boolean;
 
@@ -138,7 +138,7 @@ export class Ollama extends LLM<OllamaCallOptions> implements OllamaInput {
       host: this.baseUrl,
       headers: fields?.headers,
     });
-    this.keepAlive = fields?.keepAlive ?? this.keepAlive;
+    this.keepAlive = fields?.keepAlive;
 
     this.embeddingOnly = fields?.embeddingOnly;
     this.f16KV = fields?.f16Kv;