diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f2be2ee3c..880645104 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,4 +1,4 @@
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -pedantic -std=c++0x -fvisibility=hidden -fno-rtti -fno-exceptions")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wold-style-cast -pedantic -std=c++0x -fvisibility=hidden -fno-rtti -fno-exceptions")
 
 # If targeting GLES, save it into configuration header
 if(TARGET_GLES)