diff --git a/promql/functions.go b/promql/functions.go
index 242220f63..91160a039 100644
--- a/promql/functions.go
+++ b/promql/functions.go
@@ -38,7 +38,7 @@ type Function struct {
 // === time() float64 ===
 func funcTime(ev *evaluator, args Expressions) Value {
 	return Scalar{
-		V: float64(ev.Timestamp / 1000),
+		V: float64(ev.Timestamp) / 1000,
 		T: ev.Timestamp,
 	}
 }
diff --git a/promql/testdata/functions.test b/promql/testdata/functions.test
index 9b03055ed..28700f2d2 100644
--- a/promql/testdata/functions.test
+++ b/promql/testdata/functions.test
@@ -434,6 +434,9 @@ clear
 eval instant at 0m year()
   {} 1970
 
+eval instant at 1ms time()
+  0.001
+
 eval instant at 0m year(vector(1136239445))
   {} 2006