diff --git a/derive_builder/build/skeptic.rs b/derive_builder/build/skeptic.rs
index 3119eb31..4c0ebe4b 100644
--- a/derive_builder/build/skeptic.rs
+++ b/derive_builder/build/skeptic.rs
@@ -62,7 +62,7 @@ use std::io::{Write, Read};
 const DOC_TPL_DIR: &'static str = "src/doc_tpl/";
 const DOC_TPL_OUT_DIR: &'static str = "doc_tpl/";
 
-fn generate_doc_tpl_tests() -> Result<Vec<String>, Box<Error>> {
+fn generate_doc_tpl_tests() -> Result<Vec<String>, Box<dyn Error>> {
     trace!("Generating doc template tests");
     let root_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR")?);
     let mut tpl_dir = root_dir;