diff --git a/Makefile b/Makefile
index 115a6b1..9839b7a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,22 +1,20 @@
 DEVICE=/dev/ttyACM0
 
-all:
+all: firmwares
 
-firmwares += build/MockBand.guitar-wammy.hex
+firmwares: build/MockBand.guitar-wammy.hex
 build/MockBand.guitar-wammy.hex: VID=0x1bad
 build/MockBand.guitar-wammy.hex: PID=0x0004
 build/MockBand.guitar-wammy.hex: FLAGS=-DWAMMY
 
-firmwares += build/MockBand.guitar.hex
+firmwares: build/MockBand.guitar.hex
 build/MockBand.guitar.hex: VID=0x1bad
 build/MockBand.guitar.hex: PID=0x0004
 
-firmwares += build/MockBand.drums.hex
+firmwares: build/MockBand.drums.hex
 build/MockBand.drums.hex: VID=0x1bad
 build/MockBand.drums.hex: PID=0x3110
 
-all: $(firmwares)
-
 build/MockBand.%.hex: MockBand.ino
 	mkdir -p build/cache
 	rm -f build/build.options.json
@@ -37,9 +35,9 @@ flash-%: build/MockBand.%.hex
 
 dist: build/MockBand.zip
 
-build/MockBand.zip: $(firmwares)
+build/MockBand.zip: firmwares
 	rm -f $@
-	zip -r $@ README.md $^ docs/
+	zip -r $@ README.md build/*.hex docs/
 
 clean:
 	rm -rf build