diff --git a/include/log/log.h b/include/log/log.h
index 1cdf7bc..e0dc3a3 100644
--- a/include/log/log.h
+++ b/include/log/log.h
@@ -616,7 +616,12 @@
  * Use the per-tag properties "log.tag.<tagname>" to generate a runtime
  * result of non-zero to expose a log.
  */
-int __android_log_is_loggable(int prio, const char *tag, int def);
+/* default prio ANDROID_LOG_VERBOSE to ANDROID_LOG_FATAL if no property */
+#define ANDROID_LOGGABLE_FLAG_DEFAULT_MASK      0x000F
+/* Save 2 syscalls if caller guarantees to never call within signal handler */
+#define ANDROID_LOGGABLE_FLAG_NOT_WITHIN_SIGNAL 0x8000
+
+int __android_log_is_loggable(int prio, const char *tag, int flag);
 
 int __android_log_error_write(int tag, const char *subTag, int32_t uid, const char *data,
                               uint32_t dataLen);