diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..be8c515
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,5 @@
+[unstable]
+build-std = [ "core" ]
+
+[build]
+target = "avr-unknown-gnu-atmega328"