diff --git a/macros/src/codegen/idle.rs b/macros/src/codegen/idle.rs
index 55b7e6230f..77a7f9feb2 100644
--- a/macros/src/codegen/idle.rs
+++ b/macros/src/codegen/idle.rs
@@ -59,7 +59,7 @@ pub fn codegen(
             analysis,
             extra,
         ));
-        let idle_doc = &format!(" User provided idle function");
+        let idle_doc = " User provided idle function".to_string();
 
         let attrs = &idle.attrs;
         let context = &idle.context;
diff --git a/macros/src/codegen/init.rs b/macros/src/codegen/init.rs
index e8a9c8b98c..34f86f2721 100644
--- a/macros/src/codegen/init.rs
+++ b/macros/src/codegen/init.rs
@@ -66,8 +66,8 @@ pub fn codegen(app: &App, analysis: &Analysis, extra: &Extra) -> CodegenResult {
         })
         .collect();
 
-    let shared_resources_doc = &format!(" RTIC shared resource struct");
-    let local_resources_doc = &format!(" RTIC local resource struct");
+    let shared_resources_doc = " RTIC shared resource struct".to_string();
+    let local_resources_doc = " RTIC local resource struct".to_string();
     root_init.push(quote! {
         #[doc = #shared_resources_doc]
         struct #shared {
@@ -81,7 +81,7 @@ pub fn codegen(app: &App, analysis: &Analysis, extra: &Extra) -> CodegenResult {
     });
 
     let user_init_return = quote! {#shared, #local, #name::Monotonics};
-    let user_init_doc = &format!(" User provided init function");
+    let user_init_doc = " User provided init function".to_string();
 
     let user_init = quote!(
         #(#attrs)*