diff --git a/unittests/ADT/StatisticTest.cpp b/unittests/ADT/StatisticTest.cpp
index eb7a947224d..e5a0cad26d6 100644
--- a/unittests/ADT/StatisticTest.cpp
+++ b/unittests/ADT/StatisticTest.cpp
@@ -68,6 +68,8 @@ TEST(StatisticTest, Assign) {
 
 TEST(StatisticTest, API) {
   EnableStatistics();
+  // Reset beforehand to make sure previous tests don't effect this one.
+  ResetStatistics();
 
   Counter = 0;
   EXPECT_EQ(Counter, 0u);