diff --git a/crates/wiggle/src/lib.rs b/crates/wiggle/src/lib.rs
index cbc92f2662..0c82784c45 100644
--- a/crates/wiggle/src/lib.rs
+++ b/crates/wiggle/src/lib.rs
@@ -533,6 +533,14 @@ impl<'a> GuestPtr<'a, str> {
     }
 }
 
+impl<'a> GuestPtr<'a, [u8]> {
+    /// Returns a raw pointer to the string represented by a `[u8]` without
+    /// validating whether each u8 is a utf-8 codepoint.
+    pub fn as_str_ptr(&self) -> GuestPtr<str> {
+        GuestPtr::new(self.mem, self.pointer)
+    }
+}
+
 impl<T: ?Sized + Pointee> Clone for GuestPtr<'_, T> {
     fn clone(&self) -> Self {
         *self