diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 903416c..516f6b3 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -818,6 +818,9 @@
 			if (arg.mask & bit)
 				continue;
 
+			if (args[arg.idx] == 0)
+				continue;
+
 			printed += scnprintf(bf + printed, size - printed,
 					     "%s%s: ", printed ? ", " : "", field->name);
 			if (sc->arg_scnprintf && sc->arg_scnprintf[arg.idx]) {