diff --git a/cmake/QtProcessConfigureArgs.cmake b/cmake/QtProcessConfigureArgs.cmake
index 4f24d635e55..bad74187796 100644
--- a/cmake/QtProcessConfigureArgs.cmake
+++ b/cmake/QtProcessConfigureArgs.cmake
@@ -131,6 +131,9 @@ while(configure_args)
     elseif(arg STREQUAL "-device-option")
         list(POP_FRONT configure_args opt)
         list(APPEND device_options "${opt}")
+    elseif(arg STREQUAL "-qtnamespace")
+        list(POP_FRONT configure_args namespace)
+        push("-DQT_NAMESPACE=${namespace}")
     elseif(arg STREQUAL "--")
         # Everything after this argument will be passed to CMake verbatim.
         push(${configure_args})