diff --git a/lib/irrlicht/CMakeLists.txt b/lib/irrlicht/CMakeLists.txt
index 92a881c81..1371fdf11 100644
--- a/lib/irrlicht/CMakeLists.txt
+++ b/lib/irrlicht/CMakeLists.txt
@@ -94,15 +94,6 @@
 if(WIN32)
     add_definitions(-D_IRR_STATIC_LIB_)
     add_definitions(-D_CRT_SECURE_NO_WARNINGS) # Shut up about unsafe stuff
-else()
-    set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -Wall -pipe -O3 -fstrict-aliasing")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -pipe -O3 -fstrict-aliasing")
-    if(CMAKE_COMPILER_IS_GNUCC)
-        set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -fexpensive-optimizations")
-    endif()
-    if(CMAKE_COMPILER_IS_GNUCXX)
-        set(CMAKE_CXX_FLAGS   "${CMAKE_CXX_FLAGS} -fexpensive-optimizations")
-    endif()
 endif()

 if(USE_GLES2)