diff --git a/tests/expected/time/mktime.stdout b/tests/expected/time/mktime.stdout
index c9b309e63c..b351ff41f3 100644
--- a/tests/expected/time/mktime.stdout
+++ b/tests/expected/time/mktime.stdout
@@ -4,3 +4,4 @@
 -500 = -500
 0 = 0
 1531454950 = 1531454950
+gmtoff_ignored = 1
diff --git a/tests/time/mktime.c b/tests/time/mktime.c
index bc8c9c755d..beaf01c4ef 100644
--- a/tests/time/mktime.c
+++ b/tests/time/mktime.c
@@ -57,4 +57,16 @@ int main(void) {
             printf("Comparison %ld == %ld failed. Time: %s", input, output, asctime(time));
         }
     }
+
+    // mktime must not panic on out-of-range tm_gmtoff
+    {
+        struct tm tg = { 0 };
+        tg.tm_year = 124;
+        tg.tm_mon = 0;
+        tg.tm_mday = 1;
+        tg.tm_hour = 12;
+        tg.tm_gmtoff = 100000;
+        time_t result = mktime(&tg);
+        printf("gmtoff_ignored = %d\n", result != (time_t)-1);
+    }
 }