diff --git a/CMakeLists.txt b/CMakeLists.txt
index a7f3cbf..3d71e0c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,9 @@ set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}
 include(SDKMacros)
 set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
 set(LIBPROJECT 1)
+if(NOT DEFINED BUILD_NUMBER)
+	set(BUILD_NUMBER 9999)
+endif()
 include_directories(${CMAKE_CURRENT_BINARY_DIR}/pip)
 if(MINGW)
 	find_package(MinGW REQUIRED)