diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ed6f3a6..a775dc2e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -66,6 +66,7 @@ option(ISLE_BUILD_APP "Build ISLE.EXE application" ON)
 cmake_dependent_option(ISLE_BUILD_CONFIG "Build CONFIG.EXE application" ON "NOT MINGW" OFF)
 option(ISLE_USE_SMARTHEAP "Build with SmartHeap" ${MSVC_FOR_DECOMP})
 option(ISLE_USE_DX5 "Build with internal DirectX 5 SDK" ON)
+option(ISLE_DECOMP_ASSERT "Assert struct size" ${MSVC_FOR_DECOMP})
 cmake_dependent_option(ISLE_USE_DX5_LIBS "Build with internal DirectX 5 SDK Libraries" ON ISLE_USE_DX5 OFF)
 
 add_cxx_warning(parentheses)
@@ -512,7 +513,8 @@ if (MSVC)
   endif()
 endif()
 
-if (MSVC_FOR_DECOMP)
+if (ISLE_DECOMP_ASSERT)
+    message(STATUS "Decomp asserts enabled")
     foreach(tgt IN LISTS lego1_targets)
       target_compile_definitions(${tgt} PRIVATE "ENABLE_DECOMP_ASSERTS")
     endforeach()