diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b90f840..2f0014ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,14 +43,13 @@ if(WIN32)
 endif()
 
 if(CMAKE_CXX_COMPILER_ID STREQUAL GNU OR CMAKE_CXX_COMPILER_ID STREQUAL Clang)
-    set(WARNING_FLAGS
-        -Wunused-variable)
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_FLAGS}")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNING_FLAGS}")
+    set(WARNING_FLAGS   "-Wunused-variable")
+    set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} ${WARNING_FLAGS}")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 ${WARNING_FLAGS}")
 endif()
 
 if(MINGW)
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -static-libgcc")
+    set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -static-libgcc")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libgcc -static-libstdc++")
 endif()