diff --git a/src/components/Blockly/blocks/loops.js b/src/components/Blockly/blocks/loops.js
index 63fc9aa..aab8d32 100644
--- a/src/components/Blockly/blocks/loops.js
+++ b/src/components/Blockly/blocks/loops.js
@@ -2,7 +2,7 @@
 import Blockly from 'blockly';
 import { getColour } from '../helpers/colour';
 import { getCompatibleTypes } from '../helpers/types'
-
+import * as Types from '../helpers/types';
 
 Blockly.Blocks['controls_whileUntil'] = {
     /**
@@ -47,6 +47,7 @@ Blockly.Blocks['controls_for'] = {
                 {
                     "type": "field_variable",
                     "name": "VAR",
+                    "defaultType": Types.NUMBER.typeName,
                     "variable": null
                 },
                 {
@@ -97,6 +98,7 @@ Blockly.Blocks['controls_forEach'] = {
                 {
                     "type": "field_variable",
                     "name": "VAR",
+                    "defaultType": Types.NUMBER.typeName,
                     "variable": null
                 },
                 {
diff --git a/src/components/Blockly/blocks/math.js b/src/components/Blockly/blocks/math.js
index 2555502..bc24f38 100644
--- a/src/components/Blockly/blocks/math.js
+++ b/src/components/Blockly/blocks/math.js
@@ -287,7 +287,8 @@ Blockly.Blocks['math_change'] = {
                 {
                     "type": "field_variable",
                     "name": "VAR",
-                    "variable": Blockly.Msg.MATH_CHANGE_TITLE_ITEM
+                    "defaultType": Types.NUMBER.typeName,
+                    "variable": null
                 },
                 {
                     "type": "input_value",