diff --git a/cmake/QtBuild.cmake b/cmake/QtBuild.cmake
index c904743b8a4..9766e7f683f 100644
--- a/cmake/QtBuild.cmake
+++ b/cmake/QtBuild.cmake
@@ -367,11 +367,6 @@ set(QT_PLATFORM_DEFINITION_DIR "${QT_DEFAULT_PLATFORM_DEFINITION_DIR}"
 set(QT_PLATFORM_DEFINITION_DIR_ABSOLUTE "${QT_DEFAULT_PLATFORM_DEFINITION_DIR_ABSOLUTE}"
     CACHE INTERNAL "Path to directory that contains qplatformdefs.h")
 set(QT_NAMESPACE "" CACHE STRING "Qt Namespace")
-if(QT_NAMESPACE STREQUAL "")
-    set(QT_HAS_NAMESPACE OFF)
-else()
-    set(QT_HAS_NAMESPACE ON)
-endif()
 
 include(QtGlobalStateHelpers)
 
diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index 1a9a690f427..54b756d2a60 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -273,8 +273,7 @@ add_dependencies(Core ${QT_CMAKE_EXPORT_NAMESPACE}::rcc)
 add_dependencies(CorePrivate ${QT_CMAKE_EXPORT_NAMESPACE}::moc)
 add_dependencies(CorePrivate ${QT_CMAKE_EXPORT_NAMESPACE}::rcc)
 
-if (QT_NAMESPACE STREQUAL "")
-else()
+if (NOT QT_NAMESPACE STREQUAL "")
     target_compile_definitions(Core PUBLIC "QT_NAMESPACE=${QT_NAMESPACE}")
 endif()