diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7c1a1c5..20378d8 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -33,8 +33,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-13, windows-latest]
         toolchain: [1.70.0, stable, nightly]
-        # Ideally we should also test against 0.9.0, but it is too unusable to test from CI
-        zig: [0.10.1, 0.11.0, master]
+        zig: [0.10.1, 0.12.0, master]
         exclude:
           # Only test MSRV with zig stable version
           - toolchain: 1.70.0
@@ -156,6 +155,7 @@ jobs:
           cargo run zigbuild --target aarch64-unknown-linux-musl
           cargo run zigbuild --target aarch64-unknown-linux-musl --manifest-path tests/hello-rustls/Cargo.toml
       - name: Windows - Test gnu build
+        if: matrix.zig != '0.12.0'
         run: |
           cargo run zigbuild --target x86_64-pc-windows-gnu
           cargo run zigbuild --target x86_64-pc-windows-gnu --manifest-path tests/hello-windows/Cargo.toml
@@ -166,7 +166,7 @@ jobs:
         run: |
           cargo run zigbuild --target aarch64-unknown-linux-gnu --manifest-path tests/hello-rustls/Cargo.toml --features curl
       - name: Windows - Test run
-        if: matrix.os == 'windows-latest'
+        if: ${{ matrix.os == 'windows-latest' && matrix.zig != '0.12.0' }}
         run: |
           ./target/x86_64-pc-windows-gnu/debug/cargo-zigbuild.exe zigbuild --help
           ./tests/hello-windows/target/x86_64-pc-windows-gnu/debug/hello-windows.exe
diff --git a/src/zig.rs b/src/zig.rs
index b6b73d0..d4e2336 100644
--- a/src/zig.rs
+++ b/src/zig.rs
@@ -721,6 +721,7 @@ impl Zig {
         args.push("-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS".to_owned());
         args.push("-D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS".to_owned());
         args.push("-D_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS".to_owned());
+        args.push("-D_LIBCPP_PSTL_CPU_BACKEND_SERIAL".to_owned());
         args.push("-D_LIBCPP_ABI_VERSION=1".to_owned());
         args.push("-D_LIBCPP_ABI_NAMESPACE=__1".to_owned());
         if let Some(ver) = c_opts.glibc_minor_ver {