diff --git a/src/gui/rhi/qrhimetal.mm b/src/gui/rhi/qrhimetal.mm
index 329aed8b499..8f6ca5c8692 100644
--- a/src/gui/rhi/qrhimetal.mm
+++ b/src/gui/rhi/qrhimetal.mm
@@ -2328,6 +2328,9 @@ void QMetalBuffer::endFullDynamicBufferUpdateForCurrentFrame()
 
 static inline MTLPixelFormat toMetalTextureFormat(QRhiTexture::Format format, QRhiTexture::Flags flags, const QRhiMetalData *d)
 {
+#ifndef Q_OS_MACOS
+    Q_UNUSED(d);
+#endif
     const bool srgb = flags.testFlag(QRhiTexture::sRGB);
     switch (format) {
     case QRhiTexture::RGBA8: