diff --git a/libcoap-sys/build.rs b/libcoap-sys/build.rs
index 6be699d..0673b2f 100644
--- a/libcoap-sys/build.rs
+++ b/libcoap-sys/build.rs
@@ -50,9 +50,9 @@ fn main() {
     let apostrophe_remover = regex::Regex::new(r##"^"(?<content>.*)"$"##).unwrap();
     let esp_clang_args = arg_splitter.split(
         esp_include_path.args.as_str()
-    ).map(|x| apostrophe_remover.replace(x.trim(), "$content"));
-    bindgen_builder = bindgen_builder.clang_args(esp_clang_args).clang_arg("-target").clang_arg("xtensa").clang_arg("-DESP_PLATFORM");
-    for arg in esp_clang_args {
+    ).map(|x| apostrophe_remover.replace(x.trim(), "$content")).collect::<Vec<String>>::();
+    bindgen_builder = bindgen_builder.clang_args(&esp_clang_args).clang_arg("-target").clang_arg("xtensa").clang_arg("-DESP_PLATFORM");
+    for arg in &esp_clang_args {
         println!("cargo:warning={}", arg);
     }