diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 4413850..d272622 100755
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -10,6 +10,9 @@ set(CURRENT_PROJECT ${PROJECT_NAME})
 
 project(QtBigint LANGUAGES CXX)
 
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
 file(GLOB SOURCE_CPP
     "*.cpp"
     "mini-gmp.c"