diff --git a/spin/Makefile b/spin/Makefile
index 94327413..6e1d2ec3 100644
--- a/spin/Makefile
+++ b/spin/Makefile
@@ -1,4 +1,4 @@
-all: spin.wasm
+all: spin.wasm.js
 
 clean: src/spin.c
 	rm -f build/*
@@ -10,4 +10,7 @@ build/spin.o: build/spin.ll
 	llc -march=wasm32 -filetype=obj build/spin.ll -o build/spin.o
 
 spin.wasm: build/spin.o
-	wasm-ld -O 4 --features=atomics,mutable-global,bulk-memory --no-check-features --allow-undefined --shared-memory --import-memory --no-entry --export-all -o spin.wasm build/spin.o
+	wasm-ld -O 4 --features=atomics,mutable-global,bulk-memory --no-check-features --allow-undefined --import-memory --no-entry --export-all -o spin.wasm build/spin.o
+
+spin.wasm.js: spin.wasm
+	cat spin.wasm | npx encode-wasm-uint8 > spin.wasm.js