diff --git a/CMakeLists.txt b/CMakeLists.txt
index ce080ded3b..de4ba36deb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -848,6 +848,10 @@ if(NOT DISABLE_WX)
 	include(FindwxWidgets OPTIONAL)
 	FIND_PACKAGE(wxWidgets COMPONENTS core aui adv)
 
+	if(_ARCH_32)
+		add_definitions(-DwxSIZE_T_IS_UINT)
+	endif()
+
 	if(wxWidgets_FOUND)
 		EXECUTE_PROCESS(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
 			COMMAND sh "${wxWidgets_CONFIG_EXECUTABLE}"