diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39ab1c0..f14dfb3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,11 +34,6 @@ ecm_setup_version(PROJECT VARIABLE_PREFIX KITEMMODELS
                         PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5ItemModelsConfigVersion.cmake"
                         SOVERSION 5)
 
-add_definitions(-DQT_NO_CAST_FROM_ASCII)
-add_definitions(-DQT_NO_CAST_TO_ASCII)
-
-add_definitions(-DQT_NO_URL_CAST_FROM_STRING)
-add_definitions(-DQT_USE_QSTRINGBUILDER)
 add_subdirectory(src)
 if (BUILD_TESTING)
     add_subdirectory(autotests)