diff --git a/models/native_stat_stats.go b/models/native_stat_stats.go
index b89419d8..aea5e462 100644
--- a/models/native_stat_stats.go
+++ b/models/native_stat_stats.go
@@ -31,7 +31,7 @@ import (
 )
 
 // NativeStatStats native stat stats
-// Example: {"bin":4326578,"bout":889901290,"comp_byp":0,"comp_in":0,"comp_out":0,"comp_rsp":0,"conn_rate":12,"conn_rate_max":456,"conn_tot":45682,"dcon":0,"dreq":4,"dresp":1,"dses":0,"ereq":54,"hrsp_1xx":0,"hrsp_2xx":165,"hrsp_3xx":12,"hrsp_4xx":50,"hrsp_5xx":4,"hrsp_other":0,"iid":0,"intercepted":346,"mode":"http","pid":3204,"rate":64,"rate_lim":20000,"rate_max":4000,"req_rate":49,"req_rate_max":3965,"req_total":1254786,"scur":129,"slim":2000,"smax":2000,"status":"UP","stot":12902}
+// Example: {"bin":4326578,"bout":889901290,"comp_byp":0,"comp_in":0,"comp_out":0,"comp_rsp":0,"conn_rate":12,"conn_rate_max":456,"conn_tot":45682,"dcon":0,"dreq":4,"dresp":1,"dses":0,"ereq":54,"hrsp_1xx":0,"hrsp_2xx":165,"hrsp_3xx":12,"hrsp_4xx":50,"hrsp_5xx":4,"hrsp_other":0,"iid":0,"intercepted":346,"last_chk":"L4OK in 0ms","mode":"http","pid":3204,"rate":64,"rate_lim":20000,"rate_max":4000,"req_rate":49,"req_rate_max":3965,"req_total":1254786,"scur":129,"slim":2000,"smax":2000,"status":"UP","stot":12902}
 //
 // swagger:model native_stat_stats
 type NativeStatStats struct {
@@ -187,6 +187,9 @@ type NativeStatStats struct {
 	// intercepted
 	Intercepted *int64 `json:"intercepted,omitempty"`
 
+	// last chk
+	LastChk *string `json:"last_chk,omitempty"`
+
 	// lastchg
 	Lastchg *int64 `json:"lastchg,omitempty"`
 
diff --git a/models/native_stat_stats_compare.go b/models/native_stat_stats_compare.go
index fdfc0060..093e732f 100644
--- a/models/native_stat_stats_compare.go
+++ b/models/native_stat_stats_compare.go
@@ -220,6 +220,10 @@ func (s NativeStatStats) Equal(t NativeStatStats, opts ...Options) bool {
 		return false
 	}
 
+	if !equalPointers(s.LastChk, t.LastChk) {
+		return false
+	}
+
 	if !equalPointers(s.Lastchg, t.Lastchg) {
 		return false
 	}
@@ -543,6 +547,10 @@ func (s NativeStatStats) Diff(t NativeStatStats, opts ...Options) map[string][]i
 		diff["Intercepted"] = []interface{}{ValueOrNil(s.Intercepted), ValueOrNil(t.Intercepted)}
 	}
 
+	if !equalPointers(s.LastChk, t.LastChk) {
+		diff["LastChk"] = []interface{}{ValueOrNil(s.LastChk), ValueOrNil(t.LastChk)}
+	}
+
 	if !equalPointers(s.Lastchg, t.Lastchg) {
 		diff["Lastchg"] = []interface{}{ValueOrNil(s.Lastchg), ValueOrNil(t.Lastchg)}
 	}
diff --git a/models/native_stat_stats_compare_test.go b/models/native_stat_stats_compare_test.go
index fa711f7c..82f16cbc 100644
--- a/models/native_stat_stats_compare_test.go
+++ b/models/native_stat_stats_compare_test.go
@@ -303,7 +303,7 @@ func TestNativeStatStatsDiffFalse(t *testing.T) {
 
 	for _, sample := range samples {
 		result := sample.a.Diff(sample.b)
-		if len(result) != 78 {
+		if len(result) != 79 {
 			json := jsoniter.ConfigCompatibleWithStandardLibrary
 			a, err := json.Marshal(&sample.a)
 			if err != nil {
@@ -313,7 +313,7 @@ func TestNativeStatStatsDiffFalse(t *testing.T) {
 			if err != nil {
 				t.Errorf(err.Error())
 			}
-			t.Errorf("Expected NativeStatStats to be different in 78 cases, but it is not (%d) %s %s", len(result), a, b)
+			t.Errorf("Expected NativeStatStats to be different in 79 cases, but it is not (%d) %s %s", len(result), a, b)
 		}
 	}
 }
diff --git a/specification/build/haproxy_spec.yaml b/specification/build/haproxy_spec.yaml
index 7f18f6f2..6f27febb 100644
--- a/specification/build/haproxy_spec.yaml
+++ b/specification/build/haproxy_spec.yaml
@@ -7188,6 +7188,7 @@ definitions:
           hrsp_other: 0
           iid: 0
           intercepted: 346
+          last_chk: L4OK in 0ms
           mode: http
           pid: 3204
           rate: 64
@@ -7471,6 +7472,11 @@ definitions:
                       - frontend
                       - backend
               x-nullable: true
+          last_chk:
+              type: string
+              x-dependency:
+                  type: server
+              x-nullable: true
           lastchg:
               type: integer
               x-dependency:
diff --git a/specification/models/stats.yaml b/specification/models/stats.yaml
index c7faad47..00cd71af 100644
--- a/specification/models/stats.yaml
+++ b/specification/models/stats.yaml
@@ -384,6 +384,11 @@ native_stat_stats:
       x-nullable: true
       x-dependency:
         type: frontend
+    last_chk:
+      type: string
+      x-nullable: true
+      x-dependency:
+        type: server
   example:
     scur: 129
     smax: 2000
@@ -420,3 +425,4 @@ native_stat_stats:
     intercepted: 346
     dcon: 0
     dses: 0
+    last_chk: "L4OK in 0ms"