diff --git a/src/plugins/screencast/windowscreencastsource.cpp b/src/plugins/screencast/windowscreencastsource.cpp
index eabc94b7e7..f2a1432e4d 100644
--- a/src/plugins/screencast/windowscreencastsource.cpp
+++ b/src/plugins/screencast/windowscreencastsource.cpp
@@ -59,7 +59,7 @@ qreal WindowScreenCastSource::devicePixelRatio() const
 
 void WindowScreenCastSource::render(QImage *target)
 {
-    const auto offscreenTexture = GLTexture::allocate(GL_RGBA8, textureSize());
+    const auto offscreenTexture = GLTexture::allocate(GL_RGBA8, target->size());
     if (!offscreenTexture) {
         return;
     }