diff --git a/pkg/pprof/pprof.go b/pkg/pprof/pprof.go
index b0d6b63feb..077ccb470b 100644
--- a/pkg/pprof/pprof.go
+++ b/pkg/pprof/pprof.go
@@ -1331,6 +1331,11 @@ func sanitizeProfile(p *profilev1.Profile) {
 		if len(x.Value) != vs {
 			return true
 		}
+		for i := range x.Value {
+			if x.Value[i] < 0 {
+				x.Value[i] = 0
+			}
+		}
 		for i := range x.LocationId {
 			if x.LocationId[i] = t[x.LocationId[i]]; x.LocationId[i] == 0 {
 				return true
diff --git a/pkg/pprof/pprof_test.go b/pkg/pprof/pprof_test.go
index f6a0101f91..66869b6708 100644
--- a/pkg/pprof/pprof_test.go
+++ b/pkg/pprof/pprof_test.go
@@ -35,9 +35,11 @@ func TestNormalizeProfile(t *testing.T) {
 		},
 		Sample: []*profilev1.Sample{
 			{LocationId: []uint64{2, 3}, Value: []int64{0, 1}, Label: []*profilev1.Label{{Num: 10, Key: 1}, {Num: 11, Key: 1}}},
+			{LocationId: []uint64{3}, Value: []int64{-10, 2}, Label: []*profilev1.Label{{Num: 13, Key: 1}}},
 			// Those samples should be dropped.
 			{LocationId: []uint64{1, 2, 3}, Value: []int64{0, 0}, Label: []*profilev1.Label{{Num: 10, Key: 1}}},
 			{LocationId: []uint64{4}, Value: []int64{0, 0}, Label: []*profilev1.Label{{Num: 10, Key: 1}}},
+			{LocationId: []uint64{1, 2, 3}, Value: []int64{-1, -1}, Label: []*profilev1.Label{{Num: 10, Key: 1}}},
 		},
 		Mapping: []*profilev1.Mapping{{Id: 1, HasFunctions: true, MemoryStart: 100, MemoryLimit: 200, FileOffset: 200}},
 		Location: []*profilev1.Location{
@@ -76,6 +78,7 @@ func TestNormalizeProfile(t *testing.T) {
 		},
 		Sample: []*profilev1.Sample{
 			{LocationId: []uint64{1, 2}, Value: []int64{0, 1}, Label: []*profilev1.Label{}},
+			{LocationId: []uint64{2}, Value: []int64{0, 2}, Label: []*profilev1.Label{}},
 		},
 		Mapping: []*profilev1.Mapping{{
 			Id:           1,