diff --git a/src/base/logging.hh b/src/base/logging.hh
index 1c504d2..7040037 100644
--- a/src/base/logging.hh
+++ b/src/base/logging.hh
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2017 ARM Limited
+ * Copyright (c) 2014, 2017, 2019 ARM Limited
  * All rights reserved
  *
  * The license below extends only to copyright in the software and shall
@@ -231,6 +231,12 @@
             warn(__VA_ARGS__); \
     } while (0)
 
+#define warn_if_once(cond, ...) \
+    do { \
+        if ((cond)) \
+            warn_once(__VA_ARGS__); \
+    } while (0)
+
 /**
  * The chatty assert macro will function like a normal assert, but will allow
  * the specification of additional, helpful material to aid debugging why the