diff --git a/langchain/agents/agent.py b/langchain/agents/agent.py
index 095e736539f..01bc233a5e0 100644
--- a/langchain/agents/agent.py
+++ b/langchain/agents/agent.py
@@ -47,7 +47,10 @@ class Agent(BaseModel):
 
     @property
     def _stop(self) -> List[str]:
-        return [f"\n{self.observation_prefix}", f"\n\t{self.observation_prefix}"]
+        return [
+            f"\n{self.observation_prefix.rstrip()}",
+            f"\n\t{self.observation_prefix.rstrip()}",
+        ]
 
     def _construct_scratchpad(
         self, intermediate_steps: List[Tuple[AgentAction, str]]