diff --git a/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java b/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
index 99cf2a625..4526734d2 100644
--- a/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
+++ b/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
@@ -404,6 +404,7 @@ public Mono<Void> sendMessage(JSONRPCMessage message) {
 			}
 		}
 		catch (InterruptedException e) {
+			Thread.currentThread().interrupt(); // Preserve interrupt status
 			return Mono.error(new McpError("Failed to wait for the message endpoint"));
 		}