diff --git a/util/util.h b/util/util.h
index 17ef824..8f54040 100644
--- a/util/util.h
+++ b/util/util.h
@@ -29,6 +29,7 @@
 #include <utility>
 #include <set>
 
+#include "build/build_config.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 
 // Use std names.
@@ -45,7 +46,7 @@ using std::sort;
 using std::swap;
 using std::make_pair;
 
-#if defined(__GNUC__) && !defined(USE_CXX0X)
+#if defined(__GNUC__) && !defined(USE_CXX0X) && !defined(OS_ANDROID)
 
 #include <tr1/unordered_set>
 using std::tr1::unordered_set;
@@ -53,7 +54,7 @@ using std::tr1::unordered_set;
 #else
 
 #include <unordered_set>
-#ifdef WIN32
+#if defined(WIN32) || defined(OS_ANDROID)
 using std::tr1::unordered_set;
 #else
 using std::unordered_set;