diff --git a/build.Dockerfile b/build.Dockerfile
index 8436e0a..3ded8f8 100644
--- a/build.Dockerfile
+++ b/build.Dockerfile
@@ -41,6 +41,7 @@ ENV PATH="/osxcross/bin:$PATH" \
     SHROOMS_CFLAGS_x86_64-unknown-linux-gnu="-flto" \
     CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUSTFLAGS="-Clinker-plugin-lto -Clinker=clang -Clink-arg=-fuse-ld=lld" \
     SHROOMS_CFLAGS_x86_64-pc-windows-msvc="-flto" \
+    CFLAGS_x86_64-pc-windows-msvc="-I/xwin/crt/include -I/xwin/sdk/include/ucrt -I/xwin/sdk/include/um -I/xwin/sdk/include/shared" \
     CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_RUSTFLAGS="-Lnative=/xwin/crt/lib/x86_64 -Lnative=/xwin/sdk/lib/um/x86_64 -Lnative=/xwin/sdk/lib/ucrt/x86_64 -Clinker-plugin-lto -Clink-arg=-fuse-ld=lld" \
     CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_LINKER="lld-link-20" \
     CARGO_TARGET_X86_64_APPLE_DARWIN_LINKER="o64-clang" \