diff --git a/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix b/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
index 9496abde82fb..66941ed76987 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
@@ -1703,6 +1703,9 @@ let
 
           shampoo = ignoreCompilationError super.shampoo; # elisp error
 
+          # missing optional dependencies
+          shexc-ts-mode = addPackageRequires super.shexc-ts-mode [ self.yaml ];
+
           # missing optional dependencies and one of them (mew) is not on any ELPA
           shimbun = ignoreCompilationError (
             addPackageRequires super.shimbun [