diff --git a/src/test/testing_common.c b/src/test/testing_common.c
index ea9366305c..e3fe87cb43 100644
--- a/src/test/testing_common.c
+++ b/src/test/testing_common.c
@@ -272,6 +272,8 @@ main(int c, const char **v)
     log_severity_list_t s;
     memset(&s, 0, sizeof(s));
     set_log_severity_config(loglevel, LOG_ERR, &s);
+    /* ALWAYS log bug warnings. */
+    s.masks[LOG_WARN-LOG_ERR] |= LD_BUG;
     add_stream_log(&s, "", fileno(stdout));
   }