diff --git a/src/fields/picker/index.js b/src/fields/picker/index.js
index 655d700..bdce662 100644
--- a/src/fields/picker/index.js
+++ b/src/fields/picker/index.js
@@ -54,11 +54,11 @@ export default class PickerField extends Component {
     }
     return (
       <View
-        style={Object.assign(styles.pickerMainIOS, {
-          backgroundColor: theme.pickerBgColor,
-          borderBottomColor: theme.inputBorderColor,
-          borderBottomWidth: theme.borderWidth,
-        })}
+          style={{...styles.pickerMainIOS,
+              backgroundColor: theme.pickerBgColor,
+              borderBottomColor: theme.inputBorderColor,
+              borderBottomWidth: theme.borderWidth,
+          }}
       >
         <TouchableOpacity
           onPress={() => this.panel.toggle()}
@@ -100,4 +100,4 @@ export default class PickerField extends Component {
 
     );
   }
-}
\ No newline at end of file
+}