diff --git a/libcutils/include/cutils/trace.h b/libcutils/include/cutils/trace.h
index b2779b2..bbb150d 100644
--- a/libcutils/include/cutils/trace.h
+++ b/libcutils/include/cutils/trace.h
@@ -73,7 +73,8 @@
 #define ATRACE_TAG_NETWORK          (1<<21)
 #define ATRACE_TAG_ADB              (1<<22)
 #define ATRACE_TAG_VIBRATOR         (1<<23)
-#define ATRACE_TAG_LAST             ATRACE_TAG_VIBRATOR
+#define ATRACE_TAG_AIDL             (1<<24)
+#define ATRACE_TAG_LAST             ATRACE_TAG_AIDL
 
 // Reserved for initialization.
 #define ATRACE_TAG_NOT_READY        (1ULL<<63)