diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index 55931a2546..43ef5e4270 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -1435,6 +1435,10 @@ static int get_timezones_from_zone1970_tab(char ***ret) {
                 if (*cc == '#')
                         continue;
 
+                if (!timezone_is_valid(tz, LOG_DEBUG))
+                        /* Don't list unusable timezones. */
+                        continue;
+
                 r = strv_extend(&zones, tz);
                 if (r < 0)
                         return r;
@@ -1487,6 +1491,10 @@ static int get_timezones_from_tzdata_zi(char ***ret) {
                         /* Not a line we care about. */
                         continue;
 
+                if (!timezone_is_valid(tz, LOG_DEBUG))
+                        /* Don't list unusable timezones. */
+                        continue;
+
                 r = strv_extend(&zones, tz);
                 if (r < 0)
                         return r;