diff --git a/pkgs/by-name/wa/wasilibc/package.nix b/pkgs/by-name/wa/wasilibc/package.nix
index c5c5204454f7..219d639aadd7 100644
--- a/pkgs/by-name/wa/wasilibc/package.nix
+++ b/pkgs/by-name/wa/wasilibc/package.nix
@@ -19,6 +19,12 @@ stdenvNoLibc.mkDerivation (finalAttrs: {
     fetchSubmodules = true;
   };
 
+  # These flags break pkgsCross.wasi32.llvmPackages.libcxx
+  hardeningDisable = [
+    "libcxxhardeningfast"
+    "libcxxhardeningextensive"
+  ];
+
   outputs = [
     "out"
     "dev"