diff --git a/pkgs/apps/adcc/default.nix b/pkgs/apps/adcc/default.nix
index 22bf66c7..19a6ce80 100644
--- a/pkgs/apps/adcc/default.nix
+++ b/pkgs/apps/adcc/default.nix
@@ -32,7 +32,7 @@ buildPythonPackage rec {
     setuptools
   ];
 
-  NIX_CFLAGS_COMPILE = "-Wno-error=array-bounds";
+  env.NIX_CFLAGS_COMPILE = "-Wno-error=array-bounds";
 
   checkInputs = [ pytest pytest-cov ];
 
diff --git a/pkgs/apps/luscus/default.nix b/pkgs/apps/luscus/default.nix
index 32a61a11..394fae34 100644
--- a/pkgs/apps/luscus/default.nix
+++ b/pkgs/apps/luscus/default.nix
@@ -30,8 +30,7 @@ stdenv.mkDerivation rec {
 
   # This is missing for some reason:
   LDFLAGS = "-lGLU";
-
-  NIX_CFLAGS_COMPILE = "-fcommon";
+  env.NIX_CFLAGS_COMPILE = "-fcommon";
 
   nativeBuildInputs = [ cmake pkg-config ];
   buildInputs = [ libGLU libGL gtk2 gnome2.gtkglext ];
diff --git a/pkgs/apps/openmolcas/v18.09.nix b/pkgs/apps/openmolcas/v18.09.nix
index 1f14b804..8c00171f 100644
--- a/pkgs/apps/openmolcas/v18.09.nix
+++ b/pkgs/apps/openmolcas/v18.09.nix
@@ -64,7 +64,7 @@ in stdenv.mkDerivation {
 
   enableParallelBuilding = true;
 
-  NIX_CFLAGS_COMPILE = "-DH5_USE_110_API";
+  env.NIX_CFLAGS_COMPILE = "-DH5_USE_110_API";
 
   cmakeFlags = [
     "-DOPENMP=ON"