diff --git a/left/Cargo.toml b/left/Cargo.toml
index 1b0cabc..ac17b66 100644
--- a/left/Cargo.toml
+++ b/left/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2021"
 path = "../lib"
 package = "tangentbord1-lib"
 
-[dependencies]
+[target.thumbv6m-none-eabi.dependencies]
 cortex-m-rt = "0.7"
 embassy-rp = { version = "0.1.0", features = ["time-driver", "critical-section-impl"] }
 embassy-executor = { version = "0.5.0", features = ["nightly", "executor-thread", "integrated-timers", "arch-cortex-m"] }
diff --git a/left/src/main.rs b/left/src/main.rs
index 738af49..de6f506 100644
--- a/left/src/main.rs
+++ b/left/src/main.rs
@@ -1,9 +1,10 @@
 //! Firmware for Tangentbord1, left half.
 
-#![no_std]
+// NOTE: the order of attributes matters here..
 #![no_main]
+#![cfg(target_os = "none")] // only try to compile this for embedded
+#![no_std]
 #![feature(type_alias_impl_trait)]
-#![cfg(target_arch = "arm")]
 
 extern crate alloc;
 extern crate cortex_m_rt;
diff --git a/right/Cargo.toml b/right/Cargo.toml
index 2c419e3..16afd55 100644
--- a/right/Cargo.toml
+++ b/right/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2021"
 path = "../lib"
 package = "tangentbord1-lib"
 
-[dependencies]
+[target.thumbv6m-none-eabi.dependencies]
 cortex-m-rt = "0.7"
 embassy-rp = { version = "0.1.0", features = ["time-driver", "critical-section-impl"] }
 embassy-executor = { version = "0.5.0", features = ["nightly", "executor-thread", "integrated-timers", "arch-cortex-m"] }
diff --git a/right/src/main.rs b/right/src/main.rs
index 99c46a6..8f1262a 100644
--- a/right/src/main.rs
+++ b/right/src/main.rs
@@ -1,7 +1,9 @@
 //! Firmware for Tangentbord1, right half.
 
-#![no_std]
+// NOTE: the order of attributes matters here..
 #![no_main]
+#![cfg(target_os = "none")] // only try to compile this for embedded
+#![no_std]
 #![feature(type_alias_impl_trait)]
 
 extern crate alloc;