diff --git a/trunk/src/core/srs_core_performance.hpp b/trunk/src/core/srs_core_performance.hpp
index 6f0cc499f..6833a76d7 100644
--- a/trunk/src/core/srs_core_performance.hpp
+++ b/trunk/src/core/srs_core_performance.hpp
@@ -191,8 +191,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 /**
  * whether ensure glibc memory check.
  */
-#undef SRS_PERF_GLIBC_MEMORY_CHECK
 #define SRS_PERF_GLIBC_MEMORY_CHECK
+#undef SRS_PERF_GLIBC_MEMORY_CHECK
 
 #endif