diff --git a/src/gui/opengl/qopengltexture.cpp b/src/gui/opengl/qopengltexture.cpp
index 33c0d0bb607..02dee5a90a9 100644
--- a/src/gui/opengl/qopengltexture.cpp
+++ b/src/gui/opengl/qopengltexture.cpp
@@ -97,9 +97,11 @@ QOpenGLTexturePrivate::QOpenGLTexturePrivate(QOpenGLTexture::Target textureTarge
         break;
     case QOpenGLTexture::TargetCubeMap:
         bindingTarget = QOpenGLTexture::BindingTargetCubeMap;
+        faces = 6;
         break;
     case QOpenGLTexture::TargetCubeMapArray:
         bindingTarget = QOpenGLTexture::BindingTargetCubeMapArray;
+        faces = 6;
         break;
     case QOpenGLTexture::Target2DMultisample:
         bindingTarget = QOpenGLTexture::BindingTarget2DMultisample;