diff --git a/changes/bug29922 b/changes/bug29922
new file mode 100644
index 0000000000..dacb951097
--- /dev/null
+++ b/changes/bug29922
@@ -0,0 +1,4 @@
+  o Minor bugfixes (testing, windows):
+    - Fix a test failure caused by an unexpected bug warning in
+      our test for tor_gmtime_r(-1). Fixes bug 29922;
+      bugfix on 0.2.9.3-alpha.
diff --git a/src/test/test_util.c b/src/test/test_util.c
index 4701fadf1a..3a0eb15157 100644
--- a/src/test/test_util.c
+++ b/src/test/test_util.c
@@ -885,7 +885,9 @@ test_util_time(void *arg)
    * depending on whether the implementation of the system gmtime(_r)
    * sets struct tm (1) or not (1970) */
   t_res = -1;
+  CAPTURE();
   tor_gmtime_r(&t_res, &b_time);
+  CHECK_POSSIBLE_EINVAL();
   tt_assert(b_time.tm_year == (1970-1900) ||
             b_time.tm_year == (1969-1900));