diff --git a/.changeset/sour-rice-repeat.md b/.changeset/sour-rice-repeat.md
new file mode 100644
index 000000000..198bef824
--- /dev/null
+++ b/.changeset/sour-rice-repeat.md
@@ -0,0 +1,5 @@
+---
+'@granite-js/react-native': patch
+---
+
+return \_404 when initialScheme doesn't match prefix
diff --git a/packages/react-native/src/router/hooks/useInitialRouteName.tsx b/packages/react-native/src/router/hooks/useInitialRouteName.tsx
index 6b0b9e090..642b4cea2 100644
--- a/packages/react-native/src/router/hooks/useInitialRouteName.tsx
+++ b/packages/react-native/src/router/hooks/useInitialRouteName.tsx
@@ -5,6 +5,10 @@ export function useInitialRouteName({ prefix, initialScheme }: { prefix: string;
     return '/';
   }
 
+  if (!initialScheme.startsWith(prefix)) {
+    return '_404';
+  }
+
   const pathname = removeTrailingSlash(initialScheme).slice(prefix.length).split('?')[0];
   const shouldUseIndex = pathname?.length === 0;