diff --git a/test/test_thread.cpp b/test/test_thread.cpp
index f6804690..2a9871c1 100644
--- a/test/test_thread.cpp
+++ b/test/test_thread.cpp
@@ -41,7 +41,7 @@ void test_sleep()
 
     // Ensure it's in a range instead of checking actual equality due to time
     // lapse
-    BOOST_CHECK(in_range(xt));
+    BOOST_CHECK(in_range(xt, 2));
 }
 
 void do_test_creation()