diff --git a/CMakeLists.txt b/CMakeLists.txt
index f1fbfe8..707725f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,7 @@ endif()
 if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
 	# -Wundef -Wlong-long -Wpadded
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra  -Wzero-as-null-pointer-constant -Weffc++ -Wunknown-pragmas")
-	if (NOT CMAKE_UILD_TYPE STREQUAL "Debug")
+	if (NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
 		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
 		# set(CMAKE_SHARED_LINKER_FLAGS "")
 	endif()