diff --git a/google-api-go-generator/gen.go b/google-api-go-generator/gen.go
index 099414eb04e..33e2ee9eb67 100644
--- a/google-api-go-generator/gen.go
+++ b/google-api-go-generator/gen.go
@@ -1477,7 +1477,8 @@ func (s *Schema) writeSchemaMarshal(forceSendFieldName, nullFieldsName string) {
 func (s *Schema) writeSchemaUnmarshal() {
 	var floatProps []*Property
 	for _, p := range s.properties() {
-		if p.p.Schema.Type == "number" {
+		if p.p.Schema.Type == "number" ||
+			(p.p.Schema.Type == "array" && p.p.Schema.ItemSchema.Type == "number") {
 			floatProps = append(floatProps, p)
 		}
 	}
@@ -1495,6 +1496,9 @@ func (s *Schema) writeSchemaUnmarshal() {
 		if p.forcePointerType() {
 			typ = "*" + typ
 		}
+		if p.p.Schema.Type == "array" {
+			typ = "[]" + typ
+		}
 		pn("%s %s `json:\"%s\"`", p.assignedGoName, typ, p.p.Name)
 	}
 	pn("    *NoMethod") // embed the schema
@@ -1509,6 +1513,11 @@ func (s *Schema) writeSchemaUnmarshal() {
 		n := p.assignedGoName
 		if p.forcePointerType() {
 			pn("if s1.%s != nil { s.%s = (*float64)(s1.%s) }", n, n, n)
+		} else if p.p.Schema.Type == "array" {
+			pn("s.%s = make([]float64, len(s1.%s))", n, n)
+			pn("  for i := range s1.%s {", n)
+			pn("  s.%s[i] = float64(s1.%s[i])", n, n)
+			pn("}")
 		} else {
 			pn("s.%s = float64(s1.%s)", n, n)
 		}
diff --git a/google-api-go-generator/testdata/json-body.want b/google-api-go-generator/testdata/json-body.want
index 4f799ea199e..0f03745281d 100644
--- a/google-api-go-generator/testdata/json-body.want
+++ b/google-api-go-generator/testdata/json-body.want
@@ -1314,14 +1314,19 @@ func (s *GoogleCloudMlV1__ParameterSpec) MarshalJSON() ([]byte, error) {
 func (s *GoogleCloudMlV1__ParameterSpec) UnmarshalJSON(data []byte) error {
 	type NoMethod GoogleCloudMlV1__ParameterSpec
 	var s1 struct {
-		MaxValue gensupport.JSONFloat64 `json:"maxValue"`
-		MinValue gensupport.JSONFloat64 `json:"minValue"`
+		DiscreteValues []gensupport.JSONFloat64 `json:"discreteValues"`
+		MaxValue       gensupport.JSONFloat64   `json:"maxValue"`
+		MinValue       gensupport.JSONFloat64   `json:"minValue"`
 		*NoMethod
 	}
 	s1.NoMethod = (*NoMethod)(s)
 	if err := json.Unmarshal(data, &s1); err != nil {
 		return err
 	}
+	s.DiscreteValues = make([]float64, len(s1.DiscreteValues))
+	for i := range s1.DiscreteValues {
+		s.DiscreteValues[i] = float64(s1.DiscreteValues[i])
+	}
 	s.MaxValue = float64(s1.MaxValue)
 	s.MinValue = float64(s1.MinValue)
 	return nil
diff --git a/google-api-go-generator/testdata/variants.want b/google-api-go-generator/testdata/variants.want
index 957edc99225..4d4e0a1e630 100644
--- a/google-api-go-generator/testdata/variants.want
+++ b/google-api-go-generator/testdata/variants.want
@@ -475,6 +475,23 @@ func (s *MapFolder) MarshalJSON() ([]byte, error) {
 	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
 }
 
+func (s *MapFolder) UnmarshalJSON(data []byte) error {
+	type NoMethod MapFolder
+	var s1 struct {
+		DefaultViewport []gensupport.JSONFloat64 `json:"defaultViewport"`
+		*NoMethod
+	}
+	s1.NoMethod = (*NoMethod)(s)
+	if err := json.Unmarshal(data, &s1); err != nil {
+		return err
+	}
+	s.DefaultViewport = make([]float64, len(s1.DefaultViewport))
+	for i := range s1.DefaultViewport {
+		s.DefaultViewport[i] = float64(s1.DefaultViewport[i])
+	}
+	return nil
+}
+
 type MapItem map[string]interface{}
 
 func (t MapItem) Type() string {
@@ -551,6 +568,23 @@ func (s *MapKmlLink) MarshalJSON() ([]byte, error) {
 	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
 }
 
+func (s *MapKmlLink) UnmarshalJSON(data []byte) error {
+	type NoMethod MapKmlLink
+	var s1 struct {
+		DefaultViewport []gensupport.JSONFloat64 `json:"defaultViewport"`
+		*NoMethod
+	}
+	s1.NoMethod = (*NoMethod)(s)
+	if err := json.Unmarshal(data, &s1); err != nil {
+		return err
+	}
+	s.DefaultViewport = make([]float64, len(s1.DefaultViewport))
+	for i := range s1.DefaultViewport {
+		s.DefaultViewport[i] = float64(s1.DefaultViewport[i])
+	}
+	return nil
+}
+
 type MapLayer struct {
 	// DefaultViewport: An array of four numbers (west, south, east, north)
 	// which defines the rectangular bounding box of the default viewport.
@@ -600,3 +634,20 @@ func (s *MapLayer) MarshalJSON() ([]byte, error) {
 	raw := NoMethod(*s)
 	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
 }
+
+func (s *MapLayer) UnmarshalJSON(data []byte) error {
+	type NoMethod MapLayer
+	var s1 struct {
+		DefaultViewport []gensupport.JSONFloat64 `json:"defaultViewport"`
+		*NoMethod
+	}
+	s1.NoMethod = (*NoMethod)(s)
+	if err := json.Unmarshal(data, &s1); err != nil {
+		return err
+	}
+	s.DefaultViewport = make([]float64, len(s1.DefaultViewport))
+	for i := range s1.DefaultViewport {
+		s.DefaultViewport[i] = float64(s1.DefaultViewport[i])
+	}
+	return nil
+}