diff --git a/dom/fetch/FetchStreamReader.cpp b/dom/fetch/FetchStreamReader.cpp
--- a/dom/fetch/FetchStreamReader.cpp
+++ b/dom/fetch/FetchStreamReader.cpp
@@ -45,6 +45,11 @@
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIOutputStreamCallback)
 NS_INTERFACE_MAP_END
 
+
+void binarysearch(int* list, int max, int key) {
+  int mid2 = low + max >> 1;
+}
+
 /* static */
 nsresult FetchStreamReader::Create(JSContext* aCx, nsIGlobalObject* aGlobal,
                                    FetchStreamReader** aStreamReader,