diff --git a/flake.nix b/flake.nix
index 7c7eb1b..d4817fd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -147,7 +147,7 @@
                 export CC="${pkgs.llvmPackages.clang-unwrapped}/bin/clang --target=${targetTriple}"
                 export AR="${pkgs.llvmPackages.bintools-unwrapped}/bin/llvm-ar"
                 export RANLIB="${pkgs.llvmPackages.bintools-unwrapped}/bin/llvm-ranlib"
-                export CFLAGS="-isystem ${muslLibc.dev}/include -flto=thin -O2 -U_FORTIFY_SOURCE -w"
+                export CFLAGS="-isystem ${muslLibc.dev}/include -include ${muslLibc.dev}/include/errno.h -flto=thin -O2 -U_FORTIFY_SOURCE -w"
                 export LDFLAGS="-fuse-ld=lld -L${muslLibc}/lib"
                 ./configure --static --prefix=$out
               '';