diff --git a/packages/gatsby-plugin-sass/src/__tests__/gatsby-node.js b/packages/gatsby-plugin-sass/src/__tests__/gatsby-node.js
index ef75114d919b0..7f96d5a1fad3e 100644
--- a/packages/gatsby-plugin-sass/src/__tests__/gatsby-node.js
+++ b/packages/gatsby-plugin-sass/src/__tests__/gatsby-node.js
@@ -61,6 +61,7 @@ describe(`pluginOptionsSchema`, () => {
   it(`should provide meaningful errors when fields are invalid`, async () => {
     const expectedErrors = [
       `"implementation" must be of type object`,
+      `"cssLoaderOptions" must be of type object`,
       `"postCssPlugins" must be an array`,
       `"sassRuleTest" must be of type object`,
       `"sassRuleModulesTest" must be of type object`,
@@ -88,6 +89,7 @@ describe(`pluginOptionsSchema`, () => {
     const { errors } = await testPluginOptionsSchema(pluginOptionsSchema, {
       implementation: `This should be a require() thing`,
       postCssPlugins: `This should be an array of postCss plugins`,
+      cssLoaderOptions: `This should be an object of css-loader options`,
       sassRuleTest: `This should be a regexp`,
       sassRuleModulesTest: `This should be a regexp`,
       useResolveUrlLoader: `This should be a boolean`,
@@ -117,6 +119,7 @@ describe(`pluginOptionsSchema`, () => {
   it(`should validate the schema`, async () => {
     const { isValid } = await testPluginOptionsSchema(pluginOptionsSchema, {
       implementation: require(`../gatsby-node.js`),
+      cssLoaderOptions: { camelCase: false },
       postCssPlugins: [{ post: `CSS plugin` }],
       sassRuleTest: /\.global\.s(a|c)ss$/,
       sassRuleModulesTest: /\.mod\.s(a|c)ss$/,
diff --git a/packages/gatsby-plugin-sass/src/gatsby-node.js b/packages/gatsby-plugin-sass/src/gatsby-node.js
index 450d9c7a98649..e5df5a9749eb4 100644
--- a/packages/gatsby-plugin-sass/src/gatsby-node.js
+++ b/packages/gatsby-plugin-sass/src/gatsby-node.js
@@ -84,6 +84,11 @@ exports.pluginOptionsSchema = function ({ Joi }) {
       .description(
         `By default the node implementation of Sass (node-sass) is used. To use the implementation written in Dart (dart-sass), you can install sass instead of node-sass and pass it into the options as the implementation`
       ),
+    cssLoaderOptions: Joi.object({})
+      .unknown(true)
+      .description(
+        `Pass in options for css-loader: https://github.com/webpack-contrib/css-loader/tree/version-1#options`
+      ),
     postCssPlugins: Joi.array()
       .items(Joi.object({}).unknown(true))
       .description(`An array of postCss plugins`),