diff --git a/libcortex_a9/src/semaphore.rs b/libcortex_a9/src/semaphore.rs
index 67e6ebb..a188499 100644
--- a/libcortex_a9/src/semaphore.rs
+++ b/libcortex_a9/src/semaphore.rs
@@ -12,7 +12,7 @@ pub struct Semaphore {
 }
 
 impl Semaphore {
-    pub fn new(value: i32, max: i32) -> Self {
+    pub const fn new(value: i32, max: i32) -> Self {
         Semaphore { value: AtomicI32::new(value), max}
     }