diff --git a/bindings/wasm/Makefile b/bindings/wasm/Makefile
index 6f32e69..af4084b 100644
--- a/bindings/wasm/Makefile
+++ b/bindings/wasm/Makefile
@@ -9,7 +9,7 @@ endif
 all:
 	wasm-pack build --target web --scope ironcalc --release
 	cp README.pkg.md pkg/README.md
-	tsc types.ts --target esnext --module esnext
+	npx tsc types.ts --target esnext --module esnext
 	$(PYTHON) fix_types.py
 	rm -f types.js