diff --git a/src/lib.rs b/src/lib.rs
index fa1267c..19ffbdc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -433,6 +433,13 @@ fn get_num_cpus() -> usize {
     unsafe { hermit_abi::get_processor_count() }
 }
 
+#[cfg(target_os = "vxworks")]
+fn get_num_cpus() -> usize {
+    unsafe {
+        libc::vxCpuEnabledGet().count_ones as usize
+    }
+}
+
 #[cfg(not(any(
     target_os = "nacl",
     target_os = "macos",
@@ -449,6 +456,7 @@ fn get_num_cpus() -> usize {
     target_os = "netbsd",
     target_os = "haiku",
     target_os = "hermit",
+    target_os = "vxworks",
     windows,
 )))]
 fn get_num_cpus() -> usize {