diff --git a/src/include/sof/trace/preproc.h b/src/include/sof/trace/preproc.h
index 17a7994fcb43..8f9677d4f399 100644
--- a/src/include/sof/trace/preproc.h
+++ b/src/include/sof/trace/preproc.h
@@ -158,8 +158,10 @@
 		return_t META_CONCAT(prefix, postfix) (args)
 
 /* counteract compiler warning about unused variables */
+#ifndef UNUSED
 #define UNUSED(arg1, ...) do { META_RECURSE( \
 	META_MAP_AGGREGATE(1, _META_VOID2, _META_VOID(arg1), __VA_ARGS__)); \
 	} while (0)
+#endif
 
 #endif /* __SOF_TRACE_PREPROC_H__ */