diff --git a/CMakeLists.txt b/CMakeLists.txt
index b4802fc..df917da 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,10 +21,7 @@ endif()
 
 if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Werror -pedantic -Wno-deprecated-declarations -Wno-variadic-macros")
-
-	if(NOT(CMAKE_BUILD_TYPE STREQUAL "Debug"))
-		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3")
-	endif()
+	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
 endif()
 
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -D_DEBUG")