diff --git a/server/TetherController.cpp b/server/TetherController.cpp
index 6617c6a..7bf4a92 100644
--- a/server/TetherController.cpp
+++ b/server/TetherController.cpp
@@ -46,7 +46,7 @@
 const char SEPARATOR[] = "|";
 
 bool writeToFile(const char* filename, const char* value) {
-    int fd = open(filename, O_WRONLY);
+    int fd = open(filename, O_WRONLY | O_CLOEXEC);
     if (fd < 0) {
         ALOGE("Failed to open %s: %s", filename, strerror(errno));
         return false;