diff --git a/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix b/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
index fdd699a5d783..3b5dd1c2912b 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
@@ -551,6 +551,13 @@ let
           '';
         });
 
+        units-mode = super.units-mode.overrideAttrs (attrs: {
+          postPatch = attrs.postPatch or "" + ''
+            substituteInPlace units-mode.el \
+              --replace-fail 'units-binary-path "units"' 'units-binary-path "${lib.getExe pkgs.units}"'
+          '';
+        });
+
         vdiff-magit = super.vdiff-magit.overrideAttrs (attrs: {
           nativeBuildInputs =
             (attrs.nativeBuildInputs or [ ]) ++ [ pkgs.git ];