diff --git a/cargo/build.rs b/cargo/build.rs
index d6f8760..028bb4d 100644
--- a/cargo/build.rs
+++ b/cargo/build.rs
@@ -1,5 +1,5 @@
-{%- if hal %}
 fn main() {
+{%- if hal %}
     embuild::espidf::sysenv::output();
-}
 {%- endif %}
+}