diff --git a/flake.nix b/flake.nix
index 1ab4d99..a0f1082 100644
--- a/flake.nix
+++ b/flake.nix
@@ -56,7 +56,6 @@
           llvmPackages.libclang
           llvmPackages.llvm
           rust-analyzer
-          rust-cbindgen
         ];
       };
     });
diff --git a/generate-bindings b/generate-bindings
index 9f09a72..568e232 100755
--- a/generate-bindings
+++ b/generate-bindings
@@ -1,64 +1,5 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# TODO this is a complete vibe-coded hack, but the header patching at least is crucial
-
-# Prepare Rust artifacts and C header for hs-bindgen.
-#
-# Pipeline:
-#   1. cargo build       - build the Rust static library
-#   2. cbindgen           - generate a C header from the Rust source
-#   3. awk                - patch the header for hs-bindgen compatibility
-#
-# System include paths (needed by libclang on NixOS) are detected
-# automatically at TH compile time by GarnetRs.Raw — no env vars needed.
-#
-# Prerequisites: run inside the Nix dev shell (provides gcc, cbindgen).
-
-SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-RUST_DIR="$SCRIPT_DIR/rust"
-HEADER_NAME="garnet_rs.h"
-HEADER="$RUST_DIR/target/debug/$HEADER_NAME"
-
-# --- Step 1: Build Rust static library ---
-echo "=== Building Rust library ==="
-cargo build --manifest-path "$RUST_DIR/Cargo.toml"
-
-# --- Step 2: Generate C header with cbindgen ---
-echo "=== Running cbindgen ==="
-cbindgen \
-  --lang c \
-  --crate garnet-rs \
-  --output "$HEADER" \
-  --style tag \
-  "$RUST_DIR"
-
-echo "  Raw header written to $HEADER"
-
-# --- Step 3: Patch the header for hs-bindgen compatibility ---
-#
-# cbindgen emits:    union { ... };       (anonymous)
-# hs-bindgen needs:  union { ... } body;  (named)
-# See: https://github.com/well-typed/hs-bindgen/issues/1649
-echo "=== Patching header ==="
-awk '
-# Name anonymous unions: }; at end of union block inside struct -> } body;
-/^  \};$/ && saw_union {
-    print "  } body;"
-    saw_union = 0
-    next
-}
-/^  union \{$/ {
-    saw_union = 1
-}
-
-{ print }
-' "$HEADER" > "${HEADER}.tmp" && mv "${HEADER}.tmp" "$HEADER"
-
-echo "  Patched header at $HEADER"
-
-echo "=== Done ==="
-echo "Run 'cabal run' to test."
-
 # place static lib in position for bundling with Cabal
 cp rust/target/debug/libgarnet_rs.a $(cabal list-bin . | sed -e 's=x/garnet/build/garnet/garnet=build=g')
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index abaa784..f4b78d8 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -2,6 +2,622 @@
 # It is not intended for manual editing.
 version = 4
 
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+ "windows-link",
+]
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+[[package]]
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+ "wit-bindgen-rust-macro",
+]
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+ "indexmap",
+ "prettyplease",
+ "syn",
+ "wasm-metadata",
+ "wit-bindgen-core",
+ "wit-component",
+]
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+ "log",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "wasm-encoder",
+ "wasm-metadata",
+ "wasmparser",
+ "wit-parser",
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+ "anyhow",
+ "id-arena",
+ "indexmap",
+ "log",
+ "semver",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "unicode-xid",
+ "wasmparser",
+]
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diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 42688cf..eacae9f 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -6,3 +6,6 @@ edition = "2024"
 [lib]
 path = "lib.rs"
 crate-type = ["staticlib"]
+
+[build-dependencies]
+cbindgen = "0.29"
diff --git a/rust/build.rs b/rust/build.rs
new file mode 100644
index 0000000..f831f35
--- /dev/null
+++ b/rust/build.rs
@@ -0,0 +1,43 @@
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+fn main() {
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+    let profile = env::var("PROFILE").unwrap();
+
+    let bindings = cbindgen::Builder::new()
+        .with_crate(&crate_dir)
+        .with_language(cbindgen::Language::C)
+        .with_style(cbindgen::Style::Tag)
+        .generate()
+        .expect("Unable to generate bindings");
+
+    // TODO vibe-coded workaround for hs-bindgen issue: https://github.com/well-typed/hs-bindgen/issues/1649
+    // would otherwise just use `.write_to_file`
+    let mut buf = Vec::new();
+    bindings.write(&mut buf);
+    let header = String::from_utf8(buf).unwrap();
+    let mut patched = String::new();
+    let mut saw_union = false;
+    for line in header.lines() {
+        if line == "  };" && saw_union {
+            patched.push_str("  } body;\n");
+            saw_union = false;
+            continue;
+        }
+        if line == "  union {" {
+            saw_union = true;
+        }
+        patched.push_str(line);
+        patched.push('\n');
+    }
+    fs::write(
+        PathBuf::from(&crate_dir)
+            .join("target")
+            .join(&profile)
+            .join("garnet_rs.h"),
+        patched,
+    )
+    .unwrap();
+}