diff --git a/promql/functions_test.go b/promql/functions_test.go
index abc8f9dc6..faf6859e7 100644
--- a/promql/functions_test.go
+++ b/promql/functions_test.go
@@ -15,7 +15,6 @@ package promql
 
 import (
 	"context"
-	"fmt"
 	"math"
 	"testing"
 	"time"
@@ -87,52 +86,3 @@ func TestKahanSum(t *testing.T) {
 	expected := 2.0
 	require.Equal(t, expected, kahanSum(vals))
 }
-
-func TestMadOverTime(t *testing.T) {
-	cases := []struct {
-		series      []int
-		expectedRes float64
-	}{
-		{
-			series:      []int{4, 6, 2, 1, 999, 1, 2},
-			expectedRes: 1,
-		},
-	}
-
-	for i, c := range cases {
-		t.Run(fmt.Sprintf("case %d", i), func(t *testing.T) {
-			engine := newTestEngine()
-			storage := teststorage.New(t)
-			t.Cleanup(func() { storage.Close() })
-
-			seriesName := "float_series"
-
-			ts := int64(0)
-			app := storage.Appender(context.Background())
-			lbls := labels.FromStrings("__name__", seriesName)
-			var err error
-			for _, num := range c.series {
-				_, err = app.Append(0, lbls, ts, float64(num))
-				require.NoError(t, err)
-				ts += int64(1 * time.Minute / time.Millisecond)
-			}
-			require.NoError(t, app.Commit())
-
-			queryAndCheck := func(queryString string, exp Vector) {
-				qry, err := engine.NewInstantQuery(context.Background(), storage, nil, queryString, timestamp.Time(ts))
-				require.NoError(t, err)
-
-				res := qry.Exec(context.Background())
-				require.NoError(t, res.Err)
-
-				vector, err := res.Vector()
-				require.NoError(t, err)
-
-				require.Equal(t, exp, vector)
-			}
-
-			queryString := fmt.Sprintf(`mad_over_time(%s[%dm])`, seriesName, len(c.series))
-			queryAndCheck(queryString, []Sample{{T: ts, F: c.expectedRes, Metric: labels.EmptyLabels()}})
-		})
-	}
-}
diff --git a/promql/parser/functions.go b/promql/parser/functions.go
index aafb375da..46d50d547 100644
--- a/promql/parser/functions.go
+++ b/promql/parser/functions.go
@@ -255,9 +255,10 @@ var Functions = map[string]*Function{
 		ReturnType: ValueTypeVector,
 	},
 	"mad_over_time": {
-		Name:       "mad_over_time",
-		ArgTypes:   []ValueType{ValueTypeMatrix},
-		ReturnType: ValueTypeVector,
+		Name:         "mad_over_time",
+		ArgTypes:     []ValueType{ValueTypeMatrix},
+		ReturnType:   ValueTypeVector,
+		Experimental: true,
 	},
 	"max_over_time": {
 		Name:       "max_over_time",
diff --git a/promql/testdata/functions.test b/promql/testdata/functions.test
index b5263a96f..b4547886a 100644
--- a/promql/testdata/functions.test
+++ b/promql/testdata/functions.test
@@ -739,6 +739,14 @@ eval instant at 1m stdvar_over_time(metric[1m])
 eval instant at 1m stddev_over_time(metric[1m])
   {} 0
 
+# Tests for mad_over_time.
+clear
+load 10s
+  metric 4 6 2 1 999 1 2
+
+eval instant at 70s mad_over_time(metric[70s])
+  {} 1
+
 # Tests for quantile_over_time
 clear