diff --git a/app/vmselect/prometheus/prometheus.go b/app/vmselect/prometheus/prometheus.go
index 414f112501..1d86ee2503 100644
--- a/app/vmselect/prometheus/prometheus.go
+++ b/app/vmselect/prometheus/prometheus.go
@@ -1034,6 +1034,11 @@ func QueryHandler(startTime time.Time, at *auth.Token, w http.ResponseWriter, r
 		start -= offset
 		end := start
 		start = end - window
+		// Do not include data point with a timestamp matching the lower boundary of the window as Prometheus does.
+		start++
+		if end < start {
+			end = start
+		}
 		if err := exportHandler(at, w, r, []string{childQuery}, etf, start, end, "promapi", 0, false, deadline); err != nil {
 			return fmt.Errorf("error when exporting data for query=%q on the time range (start=%d, end=%d): %w", childQuery, start, end, err)
 		}
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 3b34a78e12..4442b209b3 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -20,6 +20,7 @@
 * BUGFIX: vmagent: properly scrape targets via https proxy specified in `proxy_url` if `insecure_skip_verify` flag isn't set in `tls_config` section. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1116
 * BUGFUX: avoid `duplicate time series` error if `prometheus_buckets()` covers a time range with distinct set of buckets.
 * BUGFIX: prevent exponent overflow when processing extremely small values close to zero such as `2.964393875E-314`. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1114
+* BUGFIX: do not include datapoints with a timestamp `t-d` when returning results from `/api/v1/query?query=m[d]&time=t` as Prometheus does.
 
 
 # [v1.55.1](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.55.1)