diff --git a/src/lib/is-browser.ts b/src/lib/is-browser.ts
index cdf926a3e..d614d8be5 100644
--- a/src/lib/is-browser.ts
+++ b/src/lib/is-browser.ts
@@ -25,6 +25,9 @@ const isStandardBrowserEnv = () => {
 	return false
 }
 
+const isTxikijsEnv = () =>
+	typeof navigator !== 'undefined' && navigator.userAgent === 'txiki.js'
+
 const isWebWorkerEnv = () =>
 	Boolean(
 		// eslint-disable-next-line no-restricted-globals
@@ -37,7 +40,10 @@ const isReactNativeEnv = () =>
 	typeof navigator !== 'undefined' && navigator.product === 'ReactNative'
 
 const isBrowser =
-	isStandardBrowserEnv() || isWebWorkerEnv() || isReactNativeEnv()
+	isStandardBrowserEnv() ||
+	isWebWorkerEnv() ||
+	isReactNativeEnv() ||
+	isTxikijsEnv()
 
 export const isWebWorker = isWebWorkerEnv()