diff --git a/pkgs/games/2048-cli/default.nix b/pkgs/games/2048-cli/default.nix
index 947973c0fb31..bc93d51b10fd 100644
--- a/pkgs/games/2048-cli/default.nix
+++ b/pkgs/games/2048-cli/default.nix
@@ -35,7 +35,7 @@ stdenv.mkDerivation (self: {
 
   dontConfigure = true;
 
-  NIX_CFLAGS_COMPILE="-I${lib.getDev gettext}/share/gettext/";
+  env.NIX_CFLAGS_COMPILE = "-I${lib.getDev gettext}/share/gettext/";
 
   makeFlags = [
     "CC=${stdenv.cc.targetPrefix}cc"
diff --git a/pkgs/os-specific/linux/rtl8814au/default.nix b/pkgs/os-specific/linux/rtl8814au/default.nix
index d8825f018979..c11493237cdc 100644
--- a/pkgs/os-specific/linux/rtl8814au/default.nix
+++ b/pkgs/os-specific/linux/rtl8814au/default.nix
@@ -16,7 +16,7 @@ stdenv.mkDerivation {
 
   hardeningDisable = [ "pic" ];
 
-  NIX_CFLAGS_COMPILE="-Wno-error=incompatible-pointer-types";
+  env.NIX_CFLAGS_COMPILE = "-Wno-error=incompatible-pointer-types";
 
   prePatch = ''
     substituteInPlace ./Makefile \
diff --git a/pkgs/servers/mqtt/nanomq/default.nix b/pkgs/servers/mqtt/nanomq/default.nix
index 482c274f2112..ee56a44c11ca 100644
--- a/pkgs/servers/mqtt/nanomq/default.nix
+++ b/pkgs/servers/mqtt/nanomq/default.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation (finalAttrs: {
     "-DNNG_ENABLE_TLS=ON"
   ];
 
-  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-return-type";
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-return-type";
 
   meta = with lib; {
     description = "An ultra-lightweight and blazing-fast MQTT broker for IoT edge";
diff --git a/pkgs/servers/shishi/default.nix b/pkgs/servers/shishi/default.nix
index d752c1bb8aee..1e93613808d5 100644
--- a/pkgs/servers/shishi/default.nix
+++ b/pkgs/servers/shishi/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
     (enableFeature true                "arcfour")
   ];
 
-  NIX_CFLAGS_COMPILE
+  env.NIX_CFLAGS_COMPILE
     = optionalString stdenv.isDarwin "-DBIND_8_COMPAT";
 
   doCheck = true;