diff --git a/config.el b/config.el
index e8ffbef..407c45e 100644
--- a/config.el
+++ b/config.el
@@ -377,9 +377,11 @@ Bound to cmd+v in org-mode and markdown-mode."
     (if (= ncols 1) "Y"
       (concat "l" (make-string (1- ncols) ?Y)))))
 
-(defun my/org-latex-fix-tabularx (table _backend _info)
-  "Convert tabular/tabularx → tabularx{\\linewidth}{lYYY} in LaTeX output."
-  (when (stringp table)
+(defun my/org-latex-fix-tabularx (table backend _info)
+  "Convert tabular/tabularx → tabularx{\\linewidth}{lYYY} in LaTeX output.
+Skip for beamer exports — beamer uses adjustbox wrapper on plain tabular instead."
+  (when (and (stringp table)
+             (not (org-export-derived-backend-p backend 'beamer)))
     (with-temp-buffer
       (insert table)
       (goto-char (point-min))