diff --git a/pkgs/by-name/ho/horizon-eda/base.nix b/pkgs/by-name/ho/horizon-eda/base.nix
index 4e504a0027b8..31c980998aa4 100644
--- a/pkgs/by-name/ho/horizon-eda/base.nix
+++ b/pkgs/by-name/ho/horizon-eda/base.nix
@@ -55,6 +55,12 @@ rec {
     sqlite
   ];
 
+  env = {
+    NIX_CFLAGS_COMPILE = toString [
+      "-fpermissive"
+    ];
+  };
+
   CASROOT = opencascade-occt;
 
   meta = {
diff --git a/pkgs/by-name/ho/horizon-eda/package.nix b/pkgs/by-name/ho/horizon-eda/package.nix
index 92ebc186e8fa..069adb345593 100644
--- a/pkgs/by-name/ho/horizon-eda/package.nix
+++ b/pkgs/by-name/ho/horizon-eda/package.nix
@@ -18,6 +18,7 @@ stdenv.mkDerivation rec {
     src
     meta
     CASROOT
+    env
     ;
 
   # provide base for python module