diff --git a/makefile_web b/makefile_web
index a99be0cc..83e77e63 100644
--- a/makefile_web
+++ b/makefile_web
@@ -14,7 +14,7 @@ web: out/boids.js out/boids_bg.wasm out/index.html
 tarball: boids_web_root.tar
 
 boids_web_root.tar: out/boids.js out/boids_bg.wasm out/index.html
-	tar -caf $@ $<
+	tar -caf $@ $^
 
 target/$(CARGO_TARGET)/$(CARGO_PROFILE)/another-boids-in-rust.wasm: $(SRCS) Cargo.lock Cargo.toml
 	cargo build --profile $(CARGO_PROFILE) --target $(CARGO_TARGET)