diff --git a/docs/Single-server-VictoriaMetrics.md b/docs/Single-server-VictoriaMetrics.md
index 68bee367f..6f9421ca7 100644
--- a/docs/Single-server-VictoriaMetrics.md
+++ b/docs/Single-server-VictoriaMetrics.md
@@ -552,8 +552,7 @@ Extra labels may be added to all the imported metrics by passing `extra_label=na
 For example, `/api/v1/import/prometheus?extra_label=foo=bar` would add `{foo="bar"}` label to all the imported metrics.
 
 If timestamp is missing in `<metric> <value> <timestamp>` Prometheus exposition format line, then the current timestamp is used during data ingestion.
-It can be overriden by passing unix timestamp in seconds via `timestamp` query arg. The value may be fractional when millisecond precision is needed.
-For example, `/api/v1/import/prometheus?timestamp=1594370496.905`.
+It can be overriden by passing unix timestamp in *milliseconds* via `timestamp` query arg. For example, `/api/v1/import/prometheus?timestamp=1594370496905`.
 
 VictoriaMetrics accepts arbitrary number of lines in a single request to `/api/v1/import/prometheus`, i.e. it supports data streaming.
 
diff --git a/lib/protoparser/common/timestamp.go b/lib/protoparser/common/timestamp.go
index 7016b98ad..0433f6808 100644
--- a/lib/protoparser/common/timestamp.go
+++ b/lib/protoparser/common/timestamp.go
@@ -6,7 +6,7 @@ import (
 	"strconv"
 )
 
-// GetTimestamp extracts unix timestamp from `timestamp` query arg.
+// GetTimestamp extracts unix timestamp in milliseconds from `timestamp` query arg.
 //
 // It returns 0 if there is no `timestamp` query arg.
 func GetTimestamp(req *http.Request) (int64, error) {
@@ -14,10 +14,9 @@ func GetTimestamp(req *http.Request) (int64, error) {
 	if len(ts) == 0 {
 		return 0, nil
 	}
-	timestamp, err := strconv.ParseFloat(ts, 64)
+	timestamp, err := strconv.ParseInt(ts, 10, 64)
 	if err != nil {
 		return 0, fmt.Errorf("cannot parse `timestamp=%s` query arg: %w", ts, err)
 	}
-	// Convert seconds to milliseconds.
-	return int64(timestamp * 1e3), nil
+	return timestamp, nil
 }