diff --git a/cli/priority.rs b/cli/priority.rs
index 128243ff0857d2..f003f4c4ff23a4 100644
--- a/cli/priority.rs
+++ b/cli/priority.rs
@@ -23,6 +23,13 @@ use winapi::um::winbase::{
 };
 #[cfg(windows)]
 use winapi::um::winnt::PROCESS_QUERY_LIMITED_INFORMATION;
+#[cfg(target_os = "macos")]
+#[allow(non_camel_case_types)]
+type priority_t = i32;
+#[cfg(target_os = "linux")]
+#[allow(non_camel_case_types)]
+type priority_t = u32;
+
 
 pub const PRIORITY_LOW: i32 = 19;
 pub const PRIORITY_BELOW_NORMAL: i32 = 10;
@@ -35,7 +42,7 @@ pub const PRIORITY_HIGHEST: i32 = -20;
 pub fn get_priority(pid: u32) -> Result<i32, OpError> {
   unsafe {
     set_errno(Errno(0));
-    match (libc::getpriority(PRIO_PROCESS as u32, pid as id_t), errno()) {
+    match (libc::getpriority(PRIO_PROCESS as priority_t, pid as id_t), errno()) {
       (-1, Errno(0)) => Ok(PRIORITY_HIGH),
       (-1, _) => Err(OpError::from(std::io::Error::last_os_error())),
       (priority, _) => Ok(priority),
@@ -46,7 +53,7 @@ pub fn get_priority(pid: u32) -> Result<i32, OpError> {
 #[cfg(unix)]
 pub fn set_priority(pid: u32,priority: i32) -> Result<(), OpError> {
   unsafe {
-    match libc::setpriority(PRIO_PROCESS as u32, pid as id_t, priority) {
+    match libc::setpriority(PRIO_PROCESS as priority_t, pid as id_t, priority) {
       -1 => Err(OpError::from(std::io::Error::last_os_error())),
       _ => Ok(()),
     }