diff --git a/src/netbsd.rs b/src/netbsd.rs
index 0ad20b71..c4ea75e4 100644
--- a/src/netbsd.rs
+++ b/src/netbsd.rs
@@ -29,7 +29,7 @@ static GETRANDOM: LazyPtr = LazyPtr::new();
 
 fn dlsym_getrandom() -> *mut c_void {
     static NAME: &[u8] = b"getrandom\0";
-    let name_ptr = NAME.as_ptr() as *const libc::c_char;
+    let name_ptr = NAME.as_ptr().cast::<libc::c_char>();
     unsafe { libc::dlsym(libc::RTLD_DEFAULT, name_ptr) }
 }
 
diff --git a/src/util_libc.rs b/src/util_libc.rs
index 7abd590f..1d6bf9a2 100644
--- a/src/util_libc.rs
+++ b/src/util_libc.rs
@@ -74,7 +74,10 @@ pub fn sys_fill_exact(
 pub unsafe fn open_readonly(path: &str) -> Result<libc::c_int, Error> {
     debug_assert_eq!(path.as_bytes().last(), Some(&0));
     loop {
-        let fd = libc::open(path.as_ptr() as *const _, libc::O_RDONLY | libc::O_CLOEXEC);
+        let fd = libc::open(
+            path.as_ptr().cast::<libc::c_char>(),
+            libc::O_RDONLY | libc::O_CLOEXEC,
+        );
         if fd >= 0 {
             return Ok(fd);
         }