diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2523730..7998333 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -239,6 +239,10 @@ target_compile_definitions(MassBuilderSaveTool PRIVATE
     SAVETOOL_SUPPORTED_GAME_VERSION="0.10.x"
 )
 
+if(CMAKE_BUILD_TYPE STREQUAL Debug)
+    target_compile_definitions(MassBuilderSaveTool PRIVATE SAVETOOL_DEBUG_BUILD)
+endif()
+
 if(CMAKE_BUILD_TYPE STREQUAL Release)
     set_target_properties(MassBuilderSaveTool PROPERTIES OUTPUT_NAME MassBuilderSaveTool-${SAVETOOL_PROJECT_VERSION})
 endif()