diff --git a/unix/syscall_aix.go b/unix/syscall_aix.go
index e2802411..9ad8a0d4 100644
--- a/unix/syscall_aix.go
+++ b/unix/syscall_aix.go
@@ -350,7 +350,7 @@ func (w WaitStatus) Signal() Signal {
 
 func (w WaitStatus) Continued() bool { return w&0x01000000 != 0 }
 
-func (w WaitStatus) CoreDump() bool { return w&0x200 != 0 }
+func (w WaitStatus) CoreDump() bool { return w&0x80 == 0x80 }
 
 func (w WaitStatus) TrapCause() int { return -1 }