diff --git a/src/gui/kernel/qplatformgraphicsbuffer.cpp b/src/gui/kernel/qplatformgraphicsbuffer.cpp
index cc01efd6db8..d361a8fc120 100644
--- a/src/gui/kernel/qplatformgraphicsbuffer.cpp
+++ b/src/gui/kernel/qplatformgraphicsbuffer.cpp
@@ -237,7 +237,6 @@ uchar *QPlatformGraphicsBuffer::data()
 */
 int QPlatformGraphicsBuffer::byteCount() const
 {
-    Q_ASSERT(isLocked() & SWReadAccess);
     return size().height() * bytesPerLine();
 }