diff --git a/src/util.c b/src/util.c
index fada69c..1639544 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1960,13 +1960,11 @@ char *format_timespan(char *buf, size_t l, usec_t t) {
                 { "d", USEC_PER_DAY },
                 { "h", USEC_PER_HOUR },
                 { "min", USEC_PER_MINUTE },
-                { "s", USEC_PER_SEC },
-                { "ms", USEC_PER_MSEC },
-                { "us", 1 },
         };
 
         unsigned i;
         char *p = buf;
+        int k;
 
         assert(buf);
         assert(l > 0);
@@ -1983,7 +1981,6 @@ char *format_timespan(char *buf, size_t l, usec_t t) {
         /* The result of this function can be parsed with parse_usec */
 
         for (i = 0; i < ELEMENTSOF(table); i++) {
-                int k;
                 size_t n;
 
                 if (t < table[i].usec)
@@ -2001,6 +1998,10 @@ char *format_timespan(char *buf, size_t l, usec_t t) {
                 t %= table[i].usec;
         }
 
+        /* We have left a value between 0 and 59,999,999 (that is, 0s and 59.999999s) */
+        k = snprintf(p, l, "%s%llu.%06llus", p > buf ? " " : "", (unsigned long long) (t / USEC_PER_SEC), (unsigned long long) (t % USEC_PER_SEC));
+        p += MIN((size_t) k, l);
+
         *p = 0;
 
         return buf;