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-rw-r--r--pkgs/development/embedded/stm8/stm8flash/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/embedded/stm8/stm8flash/default.nix b/pkgs/development/embedded/stm8/stm8flash/default.nix
index eaf1a19c91bcc..1584ee7fdf073 100644
--- a/pkgs/development/embedded/stm8/stm8flash/default.nix
+++ b/pkgs/development/embedded/stm8/stm8flash/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   # NOTE: _FORTIFY_SOURCE requires compiling with optimization (-O)
-  NIX_CFLAGS_COMPILE = "-O";
+  env.NIX_CFLAGS_COMPILE = "-O";
 
   preBuild = ''
     export DESTDIR=$out;