diff --git a/pkgs/by-name/ho/horizon-eda/base.nix b/pkgs/by-name/ho/horizon-eda/base.nix
index dc23456051ac..0e931ff743a7 100644
--- a/pkgs/by-name/ho/horizon-eda/base.nix
+++ b/pkgs/by-name/ho/horizon-eda/base.nix
@@ -56,9 +56,6 @@ rec {
   ];
 
   env = {
-    NIX_CFLAGS_COMPILE = toString [
-      "-fpermissive"
-    ];
   };
 
   CASROOT = opencascade-occt;