diff --git a/pkgs/development/libraries/mesa/default.nix b/pkgs/development/libraries/mesa/default.nix
index ffc2ecfb463f..31e15d8242a3 100644
--- a/pkgs/development/libraries/mesa/default.nix
+++ b/pkgs/development/libraries/mesa/default.nix
@@ -225,7 +225,7 @@ stdenv.mkDerivation {
     (lib.mesonEnable "valgrind" withValgrind)
 
     # Enable Intel RT stuff when available
-    (lib.mesonEnable "intel-rt" (stdenv.hostPlatform.isx86_64 or stdenv.hostPlatform.isAarch64))
+    (lib.mesonEnable "intel-rt" (stdenv.hostPlatform.isx86_64 || stdenv.hostPlatform.isAarch64))
 
     # meson auto_features enables these, but we do not want them
     (lib.mesonEnable "gallium-mediafoundation" false) # Windows only