diff --git a/src/core/stats.c b/src/core/stats.c
index 488aa5c..8980f2b 100644
--- a/src/core/stats.c
+++ b/src/core/stats.c
@@ -184,6 +184,7 @@ static void push_assert(s_glob_stats *stats,
 
     s_assert_stats *dup = smalloc(sizeof (s_assert_stats));
     memcpy(dup, data, sizeof (s_assert_stats));
+    dup->message = strdup(data->message);
 
     dup->next = test->asserts;
     test->asserts = dup;