diff --git a/Rakefile.rb b/Rakefile.rb
index 0a762a0..0defa7a 100644
--- a/Rakefile.rb
+++ b/Rakefile.rb
@@ -10,8 +10,9 @@ GTEST_VERSION = "1.7.0"
 base_env = Rscons::Environment.new do |env|
   env.build_root = "build"
   env["CPPPATH"] << "src/lib/include"
-  env["CFLAGS"] += ["-Wall", "-O2"]
-  env["CXXFLAGS"] += ["-Wall", "-O2"]
+  env["CCFLAGS"] += ["-Wall", "-O2"]
+  env["CFLAGS"] << "-std=gnu99"
+  env["CXXFLAGS"] << "-std=gnu++11"
 end
 
 task :library do