diff --git a/CMakeLists.txt b/CMakeLists.txt
index adfb540..c5b880b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,7 @@ if(WIN32 OR (CMAKE_SYSTEM_NAME MATCHES "MINGW"))
 	add_definitions(-D__USE_MINGW_ANSI_STDIO)
 endif()
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2 -Wall")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
 
 if(CMAKE_SYSTEM_NAME MATCHES "HP-UX")
 	if(CMAKE_C_COMPILER MATCHES "gcc")