diff --git a/pkgs/tools/system/at/default.nix b/pkgs/tools/system/at/default.nix
index 1e3bf0c0050..142d33d359d 100644
--- a/pkgs/tools/system/at/default.nix
+++ b/pkgs/tools/system/at/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, fetchpatch, bison, flex, pam
+{ stdenv, fetchurl, fetchpatch, bison, flex, pam, perl
 , sendmailPath ? "/run/wrappers/bin/sendmail"
 , atWrapperPath ? "/run/wrappers/bin/at"
 }:
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  nativeBuildInputs = [ bison flex ];
+  nativeBuildInputs = [ bison flex perl /* for `prove` (tests) */ ];
 
   buildInputs = [ pam ];
 
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
     "--with-daemon_groupname=atd"
   ];
 
-  doCheck = false; # need "prove" tool
+  doCheck = true;
 
   # Ensure that "batch" can invoke the setuid "at" wrapper, if it exists, or
   # else we get permission errors (on NixOS). "batch" is a shell script, so