diff --git a/NPSimulation/CMakeLists.txt b/NPSimulation/CMakeLists.txt
index 161a1a8d4a793cf89914f2954fb869fafb758083..ec76a6cbcad7d5b648b8d6c8f95d9aaf3c63362d 100644
--- a/NPSimulation/CMakeLists.txt
+++ b/NPSimulation/CMakeLists.txt
@@ -55,7 +55,7 @@ if(rdet)
 endif()
 
 # Add root to the link and include directories
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 14)
 
 if(Geant4_gdml_FOUND)  
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DNPS_GDML")