diff --git a/Makefile b/Makefile
index 20599d11..0f708639 100644
--- a/Makefile
+++ b/Makefile
@@ -38,7 +38,7 @@ target:
 	mkdir -p $@
 
 src/rustls.h: src/*.rs cbindgen.toml
-	cbindgen --lang C > $@
+	cbindgen > $@
 
 target/$(PROFILE)/librustls_ffi.a: src/*.rs Cargo.toml
 	RUSTFLAGS="-C metadata=rustls-ffi" ${CARGO} build $(CARGOFLAGS)
diff --git a/cbindgen.toml b/cbindgen.toml
index 1a1b977a..335688d7 100644
--- a/cbindgen.toml
+++ b/cbindgen.toml
@@ -1,4 +1,5 @@
 include_guard = "RUSTLS_H"
+language = "C"
 
 usize_is_size_t = true