diff --git a/libavutil/timestamp.c b/libavutil/timestamp.c
index 6c231a517d..eab2531538 100644
--- a/libavutil/timestamp.c
+++ b/libavutil/timestamp.c
@@ -24,7 +24,7 @@ char *av_ts_make_time_string2(char *buf, int64_t ts, AVRational tb)
         snprintf(buf, AV_TS_MAX_STRING_SIZE, "NOPTS");
     } else {
         double val = av_q2d(tb) * ts;
-        double log = (fpclassify(val) == FP_ZERO ? -INFINITY : floor(log10(fabs(val))));
+        double log = (fpclassify(val) == FP_ZERO ? FP_INFINITE : floor(log10(fabs(val))));
         int precision = (isfinite(log) && log < 0) ? -log + 5 : 6;
         int last = snprintf(buf, AV_TS_MAX_STRING_SIZE, "%.*f", precision, val);
         last = FFMIN(last, AV_TS_MAX_STRING_SIZE - 1) - 1;