diff --git a/src/expvar/expvar.go b/src/expvar/expvar.go
index a30963c5a8..ffe35d62f9 100644
--- a/src/expvar/expvar.go
+++ b/src/expvar/expvar.go
@@ -249,6 +249,7 @@ func (v *Map) Delete(key string) {
 	i, found := slices.BinarySearch(v.keys, key)
 	if found {
 		v.keys = slices.Delete(v.keys, i, i+1)
+		v.m.Delete(key)
 	}
 }
 
diff --git a/src/expvar/expvar_test.go b/src/expvar/expvar_test.go
index b827c4d621..def8417953 100644
--- a/src/expvar/expvar_test.go
+++ b/src/expvar/expvar_test.go
@@ -199,6 +199,9 @@ func TestMapDelete(t *testing.T) {
 	}
 
 	colors.Delete("red")
+	if v := colors.Get("red"); v != nil {
+		t.Errorf("removed red, Get should return nil; got %v", v)
+	}
 	n = 0
 	colors.Do(func(KeyValue) { n++ })
 	if n != 1 {
@@ -214,6 +217,9 @@ func TestMapDelete(t *testing.T) {
 
 	colors.Delete("blue")
 	colors.Delete("blue")
+	if v := colors.Get("blue"); v != nil {
+		t.Errorf("removed blue, Get should return nil; got %v", v)
+	}
 	n = 0
 	colors.Do(func(KeyValue) { n++ })
 	if n != 0 {