diff --git a/boring-sys/build/main.rs b/boring-sys/build/main.rs
index 1e4ed2fb..798d5984 100644
--- a/boring-sys/build/main.rs
+++ b/boring-sys/build/main.rs
@@ -660,7 +660,7 @@ fn generate_bindings(config: &Config) {
         );
 
         // we need to add special platform header file with env for support cross building
-        let header = format!("{}/usr/include/{}", sysroot.display().to_string(), c_target);
+        let header = format!("{}/usr/include/{}", sysroot.display(), c_target);
         if PathBuf::from(&header).is_dir() {
             builder = builder.clang_arg("-I").clang_arg(&header);
         }
diff --git a/boring/src/asn1.rs b/boring/src/asn1.rs
index dabe29b6..21fbc48c 100644
--- a/boring/src/asn1.rs
+++ b/boring/src/asn1.rs
@@ -317,6 +317,7 @@ impl Asn1Time {
         unsafe {
             // for higher musl version, need to convert i32 to i64
             // https://github.com/rust-lang/libc/issues/1848
+            #[allow(clippy::useless_conversion)]
             let handle = cvt_p(ffi::ASN1_TIME_set(ptr::null_mut(), time.into()))?;
             Ok(Asn1Time::from_ptr(handle))
         }