diff --git a/api/cpp/include/slint_string.h b/api/cpp/include/slint_string.h
index f1a31c898e6..d4da51a630c 100644
--- a/api/cpp/include/slint_string.h
+++ b/api/cpp/include/slint_string.h
@@ -243,6 +243,13 @@ struct StyledText
         return *this;
     }
 
+    /// Move-assigns \a other to this StyledText instance.
+    StyledText &operator=(StyledText &&other)
+    {
+        std::swap(inner, other.inner);
+        return *this;
+    }
+
     /// Returns true if \a a is equal to \a b; otherwise returns false.
     friend bool operator==(const StyledText &a, const StyledText &b)
     {
@@ -250,7 +257,7 @@ struct StyledText
     }
 
 private:
-    void *paragraphs;
+    void *inner;
 };
 namespace private_api {