diff --git a/aos/linux_code/init.cc b/aos/linux_code/init.cc
index ca14ab3..2e47b16 100644
--- a/aos/linux_code/init.cc
+++ b/aos/linux_code/init.cc
@@ -60,6 +60,10 @@
   WriteCoreDumps();
 }
 
+const char *const kNoRealtimeEnvironmentVariable = "AOS_NO_REALTIME";
+
+}  // namespace
+
 void LockAllMemory() {
   // Allow locking as much as we want into RAM.
   SetSoftRLimit(RLIMIT_MEMLOCK, RLIM_INFINITY, false);
@@ -91,10 +95,6 @@
   free(heap_data);
 }
 
-const char *const kNoRealtimeEnvironmentVariable = "AOS_NO_REALTIME";
-
-}  // namespace
-
 void InitNRT() {
   InitStart();
   aos_core_create_shared_mem(false, false);