diff --git a/CMakeLists.txt b/CMakeLists.txt
index fc5ef69..6691e1a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,6 +9,9 @@ set(CMAKE_CXX_STANDARD          17)
 set(CPACK_PROJECT_NAME ${PROJECT_NAME})
 set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
 
+# stack 16MB
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-stack_size -Wl,0x1000000")
+# otool -lV build/ml | grep stack
 
 include_directories(/usr/local/opt/openssl/include ${CMAKE_SOURCE_DIR}/clib ${CMAKE_SOURCE_DIR} )