diff --git a/lib/nodes/test_rtt.c b/lib/nodes/test_rtt.c
index 6ccbae612..2de5d887f 100644
--- a/lib/nodes/test_rtt.c
+++ b/lib/nodes/test_rtt.c
@@ -188,11 +188,7 @@ int test_rtt_parse(struct node *n, json_t *cfg)
 				else
 					c->limit = 1000; /* default value */
 
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-result"
-				asprintf(&c->filename, "%s/%s_%d_%.0f.log", t->output, t->prefix, c->values, c->rate);
-#pragma GCC diagnostic pop
-
+				c->filename = strf("%s/%s_%d_%.0f.log", t->output, t->prefix, c->values, c->rate);
 
 				list_push(&t->cases, c);
 			}