diff --git a/src/vxworks.rs b/src/vxworks.rs
index 5c75847b..8362ef2d 100644
--- a/src/vxworks.rs
+++ b/src/vxworks.rs
@@ -1,6 +1,7 @@
 //! Implementation for VxWorks
 use crate::{util_libc::last_os_error, Error};
 use core::{
+    cmp::Ordering::{Equal, Greater, Less},
     mem::MaybeUninit,
     sync::atomic::{AtomicBool, Ordering::Relaxed},
 };
@@ -9,17 +10,19 @@ pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
     static RNG_INIT: AtomicBool = AtomicBool::new(false);
     while !RNG_INIT.load(Relaxed) {
         let ret = unsafe { libc::randSecure() };
-        if ret < 0 {
-            return Err(Error::VXWORKS_RAND_SECURE);
-        } else if ret > 0 {
-            RNG_INIT.store(true, Relaxed);
-            break;
+        match ret.cmp(&0) {
+            Greater => {
+                RNG_INIT.store(true, Relaxed);
+                break;
+            }
+            Equal => unsafe { libc::usleep(10); },
+            Less => return Err(Error::VXWORKS_RAND_SECURE),
         }
-        unsafe { libc::usleep(10) };
     }
 
     // Prevent overflow of i32
-    for chunk in dest.chunks_mut(i32::max_value() as usize) {
+    let chunk_size = usize::try_from(i32::MAX).expect("VxWorks does not support 16-bit targets");
+    for chunk in dest.chunks_mut(chunk_size) {
         let ret = unsafe { libc::randABytes(chunk.as_mut_ptr().cast::<u8>(), chunk.len() as i32) };
         if ret != 0 {
             return Err(last_os_error());