diff --git a/os/os-android.h b/os/os-android.h
index c002509..96ff5ba 100644
--- a/os/os-android.h
+++ b/os/os-android.h
@@ -62,6 +62,7 @@
 #define SHM_HUGETLB    04000
 
 #define shmid_ds shmid64_ds
+#undef __key
 
 #include <stdio.h>
 #include <linux/ashmem.h>