diff --git a/CMakeLists.txt b/CMakeLists.txt
index e58f344..df9427b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ SET(CMAKE_BUILD_TYPE "Release")
 include_directories("/usr/local/include")
 link_directories("/usr/local/lib")
 
-if (BUILD NOT STREQUAL "docker")
+if (NOT BUILD STREQUAL "docker")
     #在编译选项中加入c99支持
     add_compile_options(-std=c99)
     message(STATUS "optional:-std=c99")