diff --git a/unittests/Support/System.cpp b/unittests/Support/System.cpp
index 94f1978..5fa7b39 100644
--- a/unittests/Support/System.cpp
+++ b/unittests/Support/System.cpp
@@ -11,6 +11,6 @@
 TEST_F(SystemTest, TimeValue) {
   sys::TimeValue now = sys::TimeValue::now();
   time_t now_t = time(NULL);
-  EXPECT_TRUE(abs(static_cast<time_t>(now_t - now.toEpochTime())) < 2);
+  EXPECT_TRUE(abs(static_cast<long>(now_t - now.toEpochTime())) < 2);
 }
 }