diff --git a/SConstruct b/SConstruct
index f57c6d9c1..8abada8dc 100644
--- a/SConstruct
+++ b/SConstruct
@@ -1786,7 +1786,7 @@ if not preconfigured:
 
         # Common flags for g++/clang++ CXX compiler.
         # TODO: clean up code more to make -Wextra -Wsign-compare -Wsign-conversion -Wconversion viable
-        common_cxx_flags = '-fvisibility=hidden -fvisibility-inlines-hidden -Wall %s %s -ftemplate-depth-300 -Wsign-compare -Wshadow ' % (env['WARNING_CXXFLAGS'], pthread)
+        common_cxx_flags = '-fvisibility=hidden -fvisibility-inlines-hidden -Wall %s %s -ftemplate-depth-300 -Wc++14-extensions -Wsign-compare -Wshadow ' % (env['WARNING_CXXFLAGS'], pthread)
 
         if 'clang++' in env['CXX']:
             common_cxx_flags += ' -Wno-unsequenced '