diff --git a/SConstruct b/SConstruct
index 914226319..d714dc16a 100644
--- a/SConstruct
+++ b/SConstruct
@@ -1696,7 +1696,7 @@ if not preconfigured:
         if not env['SUNCC']:
 
             # Common flags for CXX compiler.
-            common_cxx_flags = '-ansi -Wall %s %s -ftemplate-depth-300 ' % (env['WARNING_CXXFLAGS'], pthread)
+            common_cxx_flags = '-Wall %s %s -ftemplate-depth-300 ' % (env['WARNING_CXXFLAGS'], pthread)
 
             # https://github.com/mapnik/mapnik/issues/1835
             if sys.platform == 'darwin' and env['CXX'] == 'g++':