diff --git a/pkg/tools/execute/server.go b/pkg/tools/execute/server.go
index fe7a020..596db24 100644
--- a/pkg/tools/execute/server.go
+++ b/pkg/tools/execute/server.go
@@ -748,6 +748,7 @@ func (e *Server) executeWithStdin(ctx context.Context, code, language string, ti
 		// Splice: future output goes to ring buffer instead of outputBuf.
 		lw.mu.Lock()
 		lw.w = ring
+		lw.stream = nil
 		lw.mu.Unlock()
 
 		proc := &DetachedProcess{