diff --git a/firmware/defmt-itm/src/lib.rs b/firmware/defmt-itm/src/lib.rs
index 988826c1..966c8aea 100644
--- a/firmware/defmt-itm/src/lib.rs
+++ b/firmware/defmt-itm/src/lib.rs
@@ -20,6 +20,9 @@ use core::{
 
 use cortex_m::{interrupt, itm, peripheral::ITM, register};
 
+#[cfg(armv6m)]
+compile_error!("`defmt-itm` cannot be used on Cortex-M0(+) chips, because it requires an ITM peripheral");
+
 static ENABLED: AtomicBool = AtomicBool::new(false);
 
 /// Enables defmt logging over the ITM stimulus port 0.