diff --git a/unittests/Support/TimeValueTest.cpp b/unittests/Support/TimeValueTest.cpp
index e0368d3d409..8058812ff4e 100644
--- a/unittests/Support/TimeValueTest.cpp
+++ b/unittests/Support/TimeValueTest.cpp
@@ -17,7 +17,7 @@ namespace {
 TEST(TimeValue, time_t) {
   sys::TimeValue now = sys::TimeValue::now();
   time_t now_t = time(NULL);
-  EXPECT_TRUE(abs(static_cast<long>(now_t - now.toEpochTime())) < 2);
+  EXPECT_TRUE(std::abs(static_cast<long>(now_t - now.toEpochTime())) < 2);
 }
 
 TEST(TimeValue, Win32FILETIME) {