diff --git a/build.rs b/build.rs
index 1dff69fcc8bfe297db075460b6b07159ade23385..31237c6147e20ac0ba497b4d7f3a6d90368de786 100644
--- a/build.rs
+++ b/build.rs
@@ -101,7 +101,7 @@ fn zip_dir(src_dir: &PathBuf, dst_file: &PathBuf, method: CompressionMethod) ->
             f.read_to_end(&mut buffer)?;
             zip.write_all(&*buffer)?;
             buffer.clear();
-        } else if name.as_os_str().len() != 0 {
+        } else if !name.as_os_str().is_empty() {
             zip.add_directory(file_path, options)?;
         }
     }
diff --git a/metadata/lib.rs b/metadata/lib.rs
index 4f7fa75446178b80daf9c14ef3b04fac5ca33ebd..40f91821231634bc79618c816537e344151ecbb7 100644
--- a/metadata/lib.rs
+++ b/metadata/lib.rs
@@ -349,7 +349,7 @@ impl ContractBuilder {
             .map(|s| s.as_ref().to_string())
             .collect::<Vec<_>>();
 
-        if authors.len() == 0 {
+        if authors.is_empty() {
             panic!("must have at least one author")
         }