diff --git a/pkgs/os-specific/linux/pam/default.nix b/pkgs/os-specific/linux/pam/default.nix
index 9a0b2161ce47..a35f40be5955 100644
--- a/pkgs/os-specific/linux/pam/default.nix
+++ b/pkgs/os-specific/linux/pam/default.nix
@@ -29,7 +29,8 @@ stdenv.mkDerivation rec {
   outputs = [ "out" "doc" "man" /* "modules" */ ];
 
   depsBuildBuild = [ buildPackages.stdenv.cc ];
-  # autoreconfHook269 is needed for `bind-locales.patch` above
+  # autoreconfHook269 is needed for `suid-wrapper-path.patch` and
+  # `bind-locales.patch` above.
   # pkg-config-unwrapped is needed for `AC_CHECK_LIB` and `AC_SEARCH_LIBS`
   nativeBuildInputs = [ flex autoreconfHook269 pkg-config-unwrapped ]
     ++ lib.optional stdenv.buildPlatform.isDarwin gettext;
diff --git a/pkgs/os-specific/linux/pam/suid-wrapper-path.patch b/pkgs/os-specific/linux/pam/suid-wrapper-path.patch
index 71533c51a190..a427ccf38816 100644
--- a/pkgs/os-specific/linux/pam/suid-wrapper-path.patch
+++ b/pkgs/os-specific/linux/pam/suid-wrapper-path.patch
@@ -1,6 +1,6 @@
 It needs the SUID version during runtime, and that can't be in /nix/store/**
---- a/modules/pam_unix/Makefile.in
-+++ b/modules/pam_unix/Makefile.in
-@@ -651 +651 @@
+--- a/modules/pam_unix/Makefile.am
++++ b/modules/pam_unix/Makefile.am
+@@ -21 +21 @@
 -	-DCHKPWD_HELPER=\"$(sbindir)/unix_chkpwd\" \
 +	-DCHKPWD_HELPER=\"/run/wrappers/bin/unix_chkpwd\" \