diff --git a/nixos/modules/services/monitoring/apcupsd.nix b/nixos/modules/services/monitoring/apcupsd.nix
index ffa7be7dd30..6cd0254dbe3 100644
--- a/nixos/modules/services/monitoring/apcupsd.nix
+++ b/nixos/modules/services/monitoring/apcupsd.nix
@@ -39,7 +39,7 @@ let
 
   shellCmdsForEventScript = eventname: commands: ''
     echo "#!${pkgs.stdenv.shell}" > "$out/${eventname}"
-    echo "${commands}" >> "$out/${eventname}"
+    echo '${commands}' >> "$out/${eventname}"
     chmod a+x "$out/${eventname}"
   '';