diff --git a/server/BandwidthController.cpp b/server/BandwidthController.cpp
index 2fe249d..e5cf36c 100644
--- a/server/BandwidthController.cpp
+++ b/server/BandwidthController.cpp
@@ -786,7 +786,7 @@
         return -1;
 
     asprintf(&fname, "/proc/net/xt_quota/%s", costName);
-    fp = fopen(fname, "r");
+    fp = fopen(fname, "re");
     free(fname);
     if (!fp) {
         ALOGE("Reading quota %s failed (%s)", costName, strerror(errno));
@@ -843,7 +843,7 @@
     }
 
     asprintf(&fname, "/proc/net/xt_quota/%s", quotaName);
-    fp = fopen(fname, "w");
+    fp = fopen(fname, "we");
     free(fname);
     if (!fp) {
         ALOGE("Updating quota %s failed (%s)", quotaName, strerror(errno));