diff --git a/pkgs/applications/kde/print-manager.nix b/pkgs/applications/kde/print-manager.nix
index f869f984e001..f0501ffadee4 100644
--- a/pkgs/applications/kde/print-manager.nix
+++ b/pkgs/applications/kde/print-manager.nix
@@ -22,8 +22,5 @@ mkDerivation {
   outputs = [ "out" "dev" ];
   # Fix build with cups deprecations etc.
   # See: https://github.com/NixOS/nixpkgs/issues/73334
-  NIX_CFLAGS_COMPILE = [
-    "-Wno-error=deprecated-declarations"
-    "-Wno-error=format-security"
-  ];
+  NIX_CFLAGS_COMPILE = "-Wno-error=deprecated-declarations -Wno-error=format-security";
 }
diff --git a/pkgs/applications/networking/instant-messengers/signal-cli/default.nix b/pkgs/applications/networking/instant-messengers/signal-cli/default.nix
index c821c4b0f44e..8471f43c6dd0 100644
--- a/pkgs/applications/networking/instant-messengers/signal-cli/default.nix
+++ b/pkgs/applications/networking/instant-messengers/signal-cli/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     sha256 = "082kq8kadxbwzf31fmlq4in714id2irk0hhqsl53vsl3wmv45zvv";
   };
 
-  buildInputs = lib.optional stdenv.isLinux [ libmatthew_java dbus dbus_java ];
+  buildInputs = lib.optionals stdenv.isLinux [ libmatthew_java dbus dbus_java ];
   nativeBuildInputs = [ makeWrapper ];
 
   installPhase = ''
diff --git a/pkgs/development/compilers/ghc/head.nix b/pkgs/development/compilers/ghc/head.nix
index c49222f49da3..415f6c74ad58 100644
--- a/pkgs/development/compilers/ghc/head.nix
+++ b/pkgs/development/compilers/ghc/head.nix
@@ -173,7 +173,7 @@ stdenv.mkDerivation (rec {
     "CONF_GCC_LINKER_OPTS_STAGE2=-fuse-ld=gold"
   ] ++ stdenv.lib.optionals (disableLargeAddressSpace) [
     "--disable-large-address-space"
-  ] ++ stdenv.lib.optional enableDwarf [
+  ] ++ stdenv.lib.optionals enableDwarf [
     "--enable-dwarf-unwind"
     "--with-libdw-includes=${stdenv.lib.getDev elfutils}/include"
     "--with-libdw-libraries=${stdenv.lib.getLib elfutils}/lib"