diff --git a/openapi3gen/openapi3gen.go b/openapi3gen/openapi3gen.go
index 9eae7ccbb..78e6901dc 100644
--- a/openapi3gen/openapi3gen.go
+++ b/openapi3gen/openapi3gen.go
@@ -195,14 +195,16 @@ func (g *Generator) generateWithoutSaving(parents []*theTypeInfo, t reflect.Type
 			return nil, &CycleError{}
 		}
 	}
-
-	if cap(parents) == 0 {
+	isRoot := cap(parents) == 0
+	if isRoot {
 		parents = make([]*theTypeInfo, 0, 4)
 	}
 	parents = append(parents, typeInfo)
 
+	isNullable := false
 	for t.Kind() == reflect.Ptr {
 		t = t.Elem()
+		isNullable = !isRoot
 	}
 
 	if strings.HasSuffix(t.Name(), "Ref") {
@@ -231,6 +233,7 @@ func (g *Generator) generateWithoutSaving(parents []*theTypeInfo, t reflect.Type
 	}
 
 	schema := &openapi3.Schema{}
+	schema.Nullable = isNullable
 
 	switch t.Kind() {
 	case reflect.Func, reflect.Chan:
diff --git a/openapi3gen/openapi3gen_test.go b/openapi3gen/openapi3gen_test.go
index 8263983a7..4d9c1e208 100644
--- a/openapi3gen/openapi3gen_test.go
+++ b/openapi3gen/openapi3gen_test.go
@@ -108,11 +108,13 @@ func ExampleGenerator_SchemaRefs() {
 	//     "json": {},
 	//     "map": {
 	//       "additionalProperties": {
+	//         "nullable": true,
 	//         "type": "string"
 	//       },
 	//       "type": "object"
 	//     },
 	//     "ptr": {
+	//       "nullable": true,
 	//       "type": "string"
 	//     },
 	//     "slice": {
@@ -178,6 +180,7 @@ func ExampleThrowErrorOnCycle() {
 	// schemaRef: {
 	//   "properties": {
 	//     "a": {
+	//       "nullable": true,
 	//       "properties": {
 	//         "b": {
 	//           "$ref": "#/components/schemas/CyclicType0"
@@ -192,6 +195,7 @@ func ExampleThrowErrorOnCycle() {
 	//   "CyclicType0": {
 	//     "properties": {
 	//       "a": {
+	//         "nullable": true,
 	//         "properties": {
 	//           "b": {
 	//             "$ref": "#/components/schemas/CyclicType0"
diff --git a/openapi3gen/simple_test.go b/openapi3gen/simple_test.go
index 99e94ae12..11b3b26a4 100644
--- a/openapi3gen/simple_test.go
+++ b/openapi3gen/simple_test.go
@@ -70,11 +70,13 @@ func Example() {
 	//     "json": {},
 	//     "map": {
 	//       "additionalProperties": {
+	//         "nullable": true,
 	//         "type": "string"
 	//       },
 	//       "type": "object"
 	//     },
 	//     "ptr": {
+	//       "nullable": true,
 	//       "type": "string"
 	//     },
 	//     "slice": {