diff --git a/javascript/Makefile b/javascript/Makefile
index 35177bcf..da31b84f 100644
--- a/javascript/Makefile
+++ b/javascript/Makefile
@@ -8,9 +8,11 @@ asm:
 		-Isources \
 		-g0 \
 		-Os \
+		--closure 1 \
 		--memory-init-file 0 \
 		-s WASM=0 \
 		-s WASM_ASYNC_COMPILATION=0 \
+		-s USE_CLOSURE_COMPILER=1 \
 		-s USE_ES6_IMPORT_META=0 \
 		-s MODULARIZE=1 \
 		-s ASSERTIONS=0 \