diff --git a/platform/commonUI/general/src/StyleSheetLoader.js b/platform/commonUI/general/src/StyleSheetLoader.js
index 29787e2ee8..7f5cabe7c1 100644
--- a/platform/commonUI/general/src/StyleSheetLoader.js
+++ b/platform/commonUI/general/src/StyleSheetLoader.js
@@ -37,6 +37,8 @@ define(
          * @param {object[]} stylesheets stylesheet extension definitions
          * @param $document Angular's jqLite-wrapped document element
          * @param {string} activeTheme the theme in use
+         * @param {string} [assetPath] the directory relative to which
+         *        stylesheets will be found
          */
         function StyleSheetLoader(stylesheets, $document, activeTheme, assetPath) {
             var head = $document.find('head'),
@@ -69,6 +71,8 @@ define(
                     stylesheet.theme === activeTheme;
             }
 
+            assetPath = assetPath || ".";
+
             // Add all stylesheets from extensions
             stylesheets.filter(matchesTheme).forEach(addStyleSheet);
         }
diff --git a/platform/commonUI/general/test/StyleSheetLoaderSpec.js b/platform/commonUI/general/test/StyleSheetLoaderSpec.js
index 272ad61bf9..4dfb20e82d 100644
--- a/platform/commonUI/general/test/StyleSheetLoaderSpec.js
+++ b/platform/commonUI/general/test/StyleSheetLoaderSpec.js
@@ -69,7 +69,7 @@ define(
 
             it("adjusts link locations", function () {
                 expect(mockElement.setAttribute)
-                    .toHaveBeenCalledWith('href', "a/b/c/d.css");
+                    .toHaveBeenCalledWith('href', "./a/b/c/d.css");
             });
 
             describe("for themed stylesheets", function () {
@@ -95,12 +95,13 @@ define(
 
                 it("includes matching themes", function () {
                     expect(mockElement.setAttribute)
-                        .toHaveBeenCalledWith('href', "a/b/c/themed.css");
+                        .toHaveBeenCalledWith('href', "./a/b/c/themed.css");
                 });
 
                 it("excludes mismatching themes", function () {
                     expect(mockElement.setAttribute)
-                        .not.toHaveBeenCalledWith('href', "a/b/c/bad-theme.css");
+                        .not
+                        .toHaveBeenCalledWith('href', "./a/b/c/bad-theme.css");
                 });
             });