diff --git a/jupyter-mime.el b/jupyter-mime.el
index 64485cf..e83135d 100644
--- a/jupyter-mime.el
+++ b/jupyter-mime.el
@@ -549,6 +549,9 @@ width and height of the image."
 
 (cl-defmethod jupyter-insert ((_mime (eql :text/plain)) data
                               &optional _metadata)
+  ;; Reset the context so that it doesn't leak into DATA if DATA has
+  ;; no ANSI sequences.
+  (setq ansi-color-context nil)
   (jupyter-insert-ansi-coded-text data)
   (insert "\n"))