diff --git a/eldoc-box.el b/eldoc-box.el
index ebe64c0..04049ee 100644
--- a/eldoc-box.el
+++ b/eldoc-box.el
@@ -234,9 +234,10 @@ Checkout `lsp-ui-doc--make-frame', `lsp-ui-doc--move-frame'."
                             `((default-minibuffer-frame . ,(selected-frame))
                               (minibuffer . ,(minibuffer-window))
                               (left-fringe . ,(frame-char-width)))))
-         (window (display-buffer-in-child-frame
-                  buffer
-                  `((child-frame-parameters . ,parameter))))
+         (window (or (and eldoc-box--frame (frame-selected-window eldoc-box--frame))
+                     (display-buffer-in-child-frame
+                      buffer
+                      `((child-frame-parameters . ,parameter)))))
          (frame (window-frame window))
          (main-frame (selected-frame)))
     (make-frame-visible frame)