diff --git a/SConstruct b/SConstruct
index 01efdc65f..b951b56cc 100644
--- a/SConstruct
+++ b/SConstruct
@@ -1789,7 +1789,7 @@ if not preconfigured:
         common_cxx_flags = '-fvisibility=hidden -fvisibility-inlines-hidden -Wall %s %s -ftemplate-depth-300 -Wsign-compare -Wshadow ' % (env['WARNING_CXXFLAGS'], pthread)
 
         if 'clang++' in env['CXX']:
-            common_cxx_flags += ' -Wno-unsequenced -Wc++14-extensions'
+            common_cxx_flags += ' -Wno-unsequenced -Wc++14-extensions '
 
         if env['DEBUG']:
             env.Append(CXXFLAGS = common_cxx_flags + '-O0')