diff --git a/src/corelib/time/qlocaltime.cpp b/src/corelib/time/qlocaltime.cpp
index 4f7496834a..60df487af6 100644
--- a/src/corelib/time/qlocaltime.cpp
+++ b/src/corelib/time/qlocaltime.cpp
@@ -222,27 +222,30 @@ int getCurrentStandardUtcOffset()
 #else
     qTzSet();
     const time_t curr = time(nullptr);
-    /* Set t to the UTC representation of curr; the time whose local standard
-       time representation coincides with that differs from curr by local time's
-       standard offset.  Note that gmtime() leaves the tm_isdst flag set to 0,
-       so mktime() will, even if local time is currently using DST, return the
-       time since epoch at which local standard time would have the same
-       representation as UTC's representation of curr. The fact that mktime()
-       also flips tm_isdst and updates the time fields to the DST-equivalent
-       time needn't concern us here; all that matters is that it returns the
-       time after epoch at which standard time's representation would have
-       matched UTC's, had it been in effect.
-    */
+    if (curr != -1) {
+        /* Set t to the UTC representation of curr; the time whose local
+           standard time representation coincides with that differs from curr by
+           local time's standard offset.  Note that gmtime() leaves the tm_isdst
+           flag set to 0, so mktime() will, even if local time is currently
+           using DST, return the time since epoch at which local standard time
+           would have the same representation as UTC's representation of
+           curr. The fact that mktime() also flips tm_isdst and updates the time
+           fields to the DST-equivalent time needn't concern us here; all that
+           matters is that it returns the time after epoch at which standard
+           time's representation would have matched UTC's, had it been in
+           effect.
+        */
 #  if defined(_POSIX_THREAD_SAFE_FUNCTIONS)
-    struct tm t;
-    if (gmtime_r(&curr, &t))
-        return curr - qMkTime(&t);
+        struct tm t;
+        if (gmtime_r(&curr, &t))
+            return curr - qMkTime(&t);
 #  else
-    if (struct tm *tp = gmtime(&curr)) {
-        struct tm t = *tp; // Copy it quick, hopefully before it can get stomped
-        return curr - qMkTime(&t);
-    }
+        if (struct tm *tp = gmtime(&curr)) {
+            struct tm t = *tp; // Copy it quick, hopefully before it can get stomped
+            return curr - qMkTime(&t);
+        }
 #  endif
+    } // else, presumably: errno == EOVERFLOW
 #endif // Platform choice
     qDebug("Unable to determine current standard time offset from UTC");
     // We can't tell, presume UTC.