diff --git a/__mocks__/wasmMock.js b/__mocks__/wasmMock.js
new file mode 100644
index 00000000..9b5d9b34
--- /dev/null
+++ b/__mocks__/wasmMock.js
@@ -0,0 +1 @@
+module.exports = "css-file-stub";
diff --git a/package.json b/package.json
index 76576363..f427e5b4 100644
--- a/package.json
+++ b/package.json
@@ -215,6 +215,7 @@
       "<rootDir>/node_modules/matrix-react-sdk/test/setupTests.js"
     ],
     "moduleNameMapper": {
+      "\\.wasm$": "<rootDir>/__mocks__/wasmMock.js",
       "\\.(css|scss)$": "<rootDir>/__mocks__/cssMock.js",
       "\\.(gif|png|svg|ttf|woff2)$": "<rootDir>/node_modules/matrix-react-sdk/__mocks__/imageMock.js",
       "\\$webapp/i18n/languages.json": "<rootDir>/node_modules/matrix-react-sdk/__mocks__/languages.json",