diff --git a/src/rules/fields_are_camel_cased.js b/src/rules/fields_are_camel_cased.js
index e99ba76..8375fac 100644
--- a/src/rules/fields_are_camel_cased.js
+++ b/src/rules/fields_are_camel_cased.js
@@ -1,12 +1,12 @@
 import { ValidationError } from '../validation_error';
-import { camelCase } from 'lodash';
+
+const camelCaseTest = RegExp('^[a-z][a-zA-Z0-9]*$');
 
 export function FieldsAreCamelCased(context) {
   return {
     FieldDefinition(node, key, parent, path, ancestors) {
       const fieldName = node.name.value;
-      const camelCased = camelCase(fieldName);
-      if (camelCased !== fieldName) {
+      if (!camelCaseTest.test(fieldName)) {
         const parentName = ancestors[ancestors.length - 1].name.value;
         context.reportError(
           new ValidationError(
diff --git a/src/rules/input_object_values_are_camel_cased.js b/src/rules/input_object_values_are_camel_cased.js
index 46ad1cd..f1af55a 100644
--- a/src/rules/input_object_values_are_camel_cased.js
+++ b/src/rules/input_object_values_are_camel_cased.js
@@ -1,5 +1,6 @@
 import { ValidationError } from '../validation_error';
-import { camelCase } from 'lodash';
+
+const camelCaseTest = RegExp('^[a-z][a-zA-Z0-9]*$');
 
 export function InputObjectValuesAreCamelCased(context) {
   return {
@@ -8,8 +9,7 @@ export function InputObjectValuesAreCamelCased(context) {
       const parentNode = ancestors[ancestors.length - 1];
 
       const fieldName = node.name.value;
-      const camelCased = camelCase(fieldName);
-      if (camelCased !== fieldName) {
+      if (!camelCaseTest.test(fieldName)) {
         const inputObjectName = parentNode.name.value;
         context.reportError(
           new ValidationError(
diff --git a/test/rules/fields_are_camel_cased.js b/test/rules/fields_are_camel_cased.js
index 42c4633..26868c2 100644
--- a/test/rules/fields_are_camel_cased.js
+++ b/test/rules/fields_are_camel_cased.js
@@ -13,6 +13,9 @@ describe('FieldsAreCamelCased rule', () => {
         # Valid
         thisIsValid: String
 
+        # Valid
+        thisIDIsValid: String
+
         # Invalid
         ThisIsInvalid: String
       }
@@ -23,6 +26,9 @@ describe('FieldsAreCamelCased rule', () => {
 
         # Valid
         thisIsValid: String
+
+        # Valid
+        thisIDIsValid: String
       }
     `,
       [
@@ -32,11 +38,11 @@ describe('FieldsAreCamelCased rule', () => {
         },
         {
           message: 'The field `A.ThisIsInvalid` is not camel cased.',
-          locations: [{ line: 10, column: 9 }],
+          locations: [{ line: 13, column: 9 }],
         },
         {
           message: 'The field `Something.invalid_name` is not camel cased.',
-          locations: [{ line: 15, column: 9 }],
+          locations: [{ line: 18, column: 9 }],
         },
       ]
     );
diff --git a/test/rules/input_object_values_are_camel_cased.js b/test/rules/input_object_values_are_camel_cased.js
index 5649e6d..5692835 100644
--- a/test/rules/input_object_values_are_camel_cased.js
+++ b/test/rules/input_object_values_are_camel_cased.js
@@ -9,6 +9,7 @@ describe('InputObjectValuesAreCamelCased rule', () => {
       input User {
         user_name: String
 
+        userID: String
         withDescription: String
       }
     `,