diff --git a/embassy-stm32/build.rs b/embassy-stm32/build.rs
index 717da9049..005ec5280 100644
--- a/embassy-stm32/build.rs
+++ b/embassy-stm32/build.rs
@@ -95,7 +95,7 @@ fn main() {
     }
 
     // Extra analog switch pins available on most H7 chips
-    let split_features = [
+    let split_features: Vec<SplitFeature> = vec![
         #[cfg(feature = "split-pa0")]
         SplitFeature {
             feature_name: "split-pa0".to_string(),