diff --git a/stm32-data-gen/src/chips.rs b/stm32-data-gen/src/chips.rs
index d73ffa0..26644a7 100644
--- a/stm32-data-gen/src/chips.rs
+++ b/stm32-data-gen/src/chips.rs
@@ -1017,7 +1017,7 @@ fn process_core(
         }
 
         // sort pins to avoid diff for c pins
-        p.pins.sort();
+        p.pins.sort_by_key(|x| (x.pin.clone(), x.signal.clone()));
 
         if let Some(peri_irqs) = chip_irqs.get(&pname) {
             use stm32_data_serde::chip::core::peripheral::Interrupt;