diff --git a/src/gui/configure.cmake b/src/gui/configure.cmake
index ea6752806e4..395902f792e 100644
--- a/src/gui/configure.cmake
+++ b/src/gui/configure.cmake
@@ -167,6 +167,7 @@ qt_config_compile_test(egl_x11
 // has to be disabled in plugins like xcb in this case since the native display,
 // window and pixmap types will be different than what an X-based platform
 // plugin would expect.
+#define USE_X11
 #include <EGL/egl.h>
 #include <X11/Xlib.h>
 
diff --git a/src/gui/opengl/platform/egl/qt_egl_p.h b/src/gui/opengl/platform/egl/qt_egl_p.h
index c33cc8aa21e..5d4e2fd6d4a 100644
--- a/src/gui/opengl/platform/egl/qt_egl_p.h
+++ b/src/gui/opengl/platform/egl/qt_egl_p.h
@@ -65,7 +65,11 @@
 # if !defined(Q_OS_INTEGRITY)
 #  define WIN_INTERFACE_CUSTOM   // NV
 # endif // Q_OS_INTEGRITY
-#endif  // QT_EGL_NO_X11
+#else // QT_EGL_NO_X11
+// If one has an eglplatform.h with https://github.com/KhronosGroup/EGL-Registry/pull/130
+// that needs USE_X11 to be defined.
+# define USE_X11
+#endif
 
 #ifdef QT_EGL_WAYLAND
 # define WAYLAND // NV