diff --git a/jupyter-org-client.el b/jupyter-org-client.el
index 2f2c157..94a73af 100644
--- a/jupyter-org-client.el
+++ b/jupyter-org-client.el
@@ -579,7 +579,7 @@ property."
             (jupyter-org--ansi-color-apply-on-region beg1 end)))
          ;; fixed width
          (t
-          (setq end (or (and (re-search-forward "^[ \t]*[^:]" nil t)
+          (setq end (or (and (re-search-forward "^[ \t]*[^ \t:]" nil t)
                              (1- (match-beginning 0)))
                         (point-max)))
           (jupyter-org--ansi-color-apply-on-region beg end)))))))
diff --git a/test/jupyter-test.el b/test/jupyter-test.el
index a2c1d29..6ce3bc7 100644
--- a/test/jupyter-test.el
+++ b/test/jupyter-test.el
@@ -2314,7 +2314,20 @@ ABCDEF
 #+end_example")
       ;; Test the cached faces path
       (remove-text-properties (point-min) (point-max) '(face))
-      (funcall test-fun 24 '(19 20 21 22 23 26 27 28 29)))))
+      (funcall test-fun 24 '(19 20 21 22 23 26 27 28 29))))
+  (ert-info ("Leading indentation")
+    (with-temp-buffer
+      (org-mode)
+      (jupyter-org-interaction-mode 1)
+      (pop-to-buffer (current-buffer))
+      (let ((beg (+ (point-min) 2)) end)
+        (insert "  : ABCDEF\n")
+        (insert "  : ABCDEF\n")
+        (setq end (1- (point)))
+        (insert "hey\n")
+        (goto-char (point-min))
+        (jupyter-org-font-lock-ansi-escapes (point-max))
+        (should-not (text-property-not-all beg end 'jupyter-ansi t))))))
 
 (ert-deftest jupyter-org-closest-jupyter-language ()
   :tags '(org)