diff --git a/cbindgen.toml b/cbindgen.toml
new file mode 100644
index 0000000..7b647ff
--- /dev/null
+++ b/cbindgen.toml
@@ -0,0 +1,8 @@
+include_guard = "TTS_RS_H"
+autogen_warning = "/* Warning, this file is autogenerated by cbindgen. Don't modify this manually. */"
+
+[defines]
+"target_os = linux" = "__linux__"
+"target_os = macos" = "__APPLE__"
+"target_arch = wasm32" = "__EMSCRIPTEN__"
+windows = "__WIN32__"