diff --git a/haystack/agents/conversational.py b/haystack/agents/conversational.py
index adb42c980..82c22c639 100644
--- a/haystack/agents/conversational.py
+++ b/haystack/agents/conversational.py
@@ -1,8 +1,8 @@
-from typing import Optional, Callable
+from typing import Optional, Callable, Union
 
 from haystack.agents import Agent
 from haystack.agents.memory import Memory, ConversationMemory
-from haystack.nodes import PromptNode
+from haystack.nodes import PromptNode, PromptTemplate
 
 
 class ConversationalAgent(Agent):
@@ -36,6 +36,7 @@ class ConversationalAgent(Agent):
     def __init__(
         self,
         prompt_node: PromptNode,
+        prompt_template: Optional[Union[str, PromptTemplate]] = None,
         memory: Optional[Memory] = None,
         prompt_parameters_resolver: Optional[Callable] = None,
     ):
@@ -43,6 +44,8 @@ class ConversationalAgent(Agent):
         Creates a new ConversationalAgent instance
 
         :param prompt_node: A PromptNode used to communicate with LLM.
+        :param prompt_template: A string or PromptTemplate instance to use as the prompt template. If no prompt_template
+        is provided, the agent will use the "conversational-agent" template.
         :param memory: A memory instance for storing conversation history and other relevant data, defaults to
         ConversationMemory.
         :param prompt_parameters_resolver: An optional callable for resolving prompt template parameters,
@@ -50,9 +53,7 @@ class ConversationalAgent(Agent):
         """
         super().__init__(
             prompt_node=prompt_node,
-            prompt_template=prompt_node.default_prompt_template
-            if prompt_node.default_prompt_template is not None
-            else "conversational-agent",
+            prompt_template=prompt_template or "conversational-agent",
             max_steps=2,
             memory=memory if memory else ConversationMemory(),
             prompt_parameters_resolver=prompt_parameters_resolver