diff --git a/scripts/build-plugins/rollup-plugin-build-themes.js b/scripts/build-plugins/rollup-plugin-build-themes.js
index e9251224..c45c5aaa 100644
--- a/scripts/build-plugins/rollup-plugin-build-themes.js
+++ b/scripts/build-plugins/rollup-plugin-build-themes.js
@@ -253,17 +253,17 @@ module.exports = function buildThemes(options) {
                 const compiledVariables = options.compiledVariables.get(location);
                 const derivedVariables = compiledVariables["derived-variables"];
                 const icon = compiledVariables["icon"];
-                const builtAsset = {};
+                const builtAssets = {};
                 /**
                  * Generate a mapping from theme name to asset hashed location of said theme in build output.
                  * This can be used to enumerate themes during runtime.
                  */
                 for (const chunk of chunkArray) {
                     const [, name, variant] = chunk.fileName.match(/theme-(.+)-(.+)\.css/);
-                    builtAsset[`${name}-${variant}`] = assetMap.get(chunk.fileName).fileName;
+                    builtAssets[`${name}-${variant}`] = assetMap.get(chunk.fileName).fileName;
                 }
                 manifest.source = {
-                    "built-asset": builtAsset,
+                    "built-assets": builtAssets,
                     "runtime-asset": assetMap.get(runtimeThemeChunk.fileName).fileName,
                     "derived-variables": derivedVariables,
                     "icon": icon
diff --git a/src/platform/web/ThemeLoader.ts b/src/platform/web/ThemeLoader.ts
index 4c0ec6d3..0234a04a 100644
--- a/src/platform/web/ThemeLoader.ts
+++ b/src/platform/web/ThemeLoader.ts
@@ -37,10 +37,10 @@ export class ThemeLoader {
                 .response();
             /*
             After build has finished, the source section of each theme manifest
-            contains `built-asset` which is a mapping from the theme-name to the
+            contains `built-assets` which is a mapping from the theme-name to the
             location of the css file in build.
             */
-            Object.assign(this._themeMapping, body["source"]["built-asset"]);
+            Object.assign(this._themeMapping, body["source"]["built-assets"]);
         }
     }