diff --git a/base/src/sys/windows/sched.rs b/base/src/sys/windows/sched.rs
index b96c954c03..26a9bc96c4 100644
--- a/base/src/sys/windows/sched.rs
+++ b/base/src/sys/windows/sched.rs
@@ -28,6 +28,9 @@ use super::Result;
 pub fn set_cpu_affinity<I: IntoIterator<Item = usize>>(cpus: I) -> Result<usize> {
     let mut affinity_mask: usize = 0;
     for cpu in cpus {
+        if cpu >= 64 {
+            return Err(Error::new(EINVAL));
+        }
         affinity_mask |= 1 << cpu;
     }
     set_cpu_affinity_mask(affinity_mask)