diff --git a/CMakeLists.txt b/CMakeLists.txt
index bc45581975..2c2a94938c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -103,6 +103,7 @@ if (UNIX AND NOT APPLE)
 endif()
 
 add_definitions(-DQT_NO_CAST_FROM_BYTEARRAY)
+add_definitions(-DQT_NO_CAST_TO_ASCII)
 
 include(CheckAtomic)