diff --git a/Keymaster.h b/Keymaster.h
index e47b403..4bc0df7 100644
--- a/Keymaster.h
+++ b/Keymaster.h
@@ -24,6 +24,7 @@
 #include <utility>
 
 #include <android/hardware/keymaster/3.0/IKeymasterDevice.h>
+#include <android-base/macros.h>
 #include <keystore/authorization_set.h>
 
 namespace android {