diff --git a/src/Makefile b/src/Makefile
index 1d71e7f6..0256c270 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -5,13 +5,9 @@ all: ../build/firmware/armv7-none-eabihf/release/szl
 .PHONY: all
 
 
-../build/pl.rs: gateware/*
+../build/pl.rs ../build/rustc-cfg: gateware/*
 	mkdir -p ../build
-	python gateware/zc706.py -r ../build/pl.rs -V $(VARIANT)
-
-../build/rustc-cfg: gateware/*
-	mkdir -p ../build
-	python gateware/zc706.py -c ../build/rustc-cfg -V $(VARIANT)
+	python gateware/zc706.py -r ../build/pl.rs -c ../build/rustc-cfg -V $(VARIANT)
 
 ../build/firmware/armv7-none-eabihf/release/runtime: ../build/pl.rs ../build/rustc-cfg $(shell find . -path ./szl -prune -o -print)
 	XBUILD_SYSROOT_PATH=`pwd`/../build/sysroot cargo xbuild --release -p runtime --target-dir ../build/firmware