diff --git a/src/sys/macos.rs b/src/sys/macos.rs
index 4a35aed..70f830c 100644
--- a/src/sys/macos.rs
+++ b/src/sys/macos.rs
@@ -105,9 +105,9 @@ impl Drop for Awake {
             }
         }
 
-        if self.display_assertion != 0 {
+        if self.idle_assertion != 0 {
             unsafe {
-                IOPMAssertionRelease(self.display_assertion);
+                IOPMAssertionRelease(self.idle_assertion);
             }
         }