diff --git a/Source/WTF/wtf/text/WTFString.h b/Source/WTF/wtf/text/WTFString.h
index fa150bb666646..9cc165c20ded7 100644
--- a/Source/WTF/wtf/text/WTFString.h
+++ b/Source/WTF/wtf/text/WTFString.h
@@ -39,6 +39,8 @@
 QT_BEGIN_NAMESPACE
 class QString;
 class QStringView;
+class QLatin1StringView;
+class QByteArrayView;
 QT_END_NAMESPACE
 #endif
 
diff --git a/Source/WTF/wtf/text/qt/StringQt.cpp b/Source/WTF/wtf/text/qt/StringQt.cpp
index 962f821a6cf03..df70b99353655 100644
--- a/Source/WTF/wtf/text/qt/StringQt.cpp
+++ b/Source/WTF/wtf/text/qt/StringQt.cpp
@@ -20,13 +20,15 @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include <QString>
 #include <QStringView>
+#include <QByteArrayView>
+#include <QLatin1StringView>
 #include <wtf/StdLibExtras.h>
 #include <wtf/text/WTFString.h>