diff --git a/src/test/checkblock_tests.cpp b/src/test/checkblock_tests.cpp
index e167defb2..3cfb6dbfa 100644
--- a/src/test/checkblock_tests.cpp
+++ b/src/test/checkblock_tests.cpp
@@ -52,7 +52,7 @@ BOOST_AUTO_TEST_CASE(May15)
     if (read_block("Mar12Fork.dat", forkingBlock))
     {
         CValidationState state;
-        BOOST_CHECK(!forkingBlock.CheckBlock(state, true, true));
+        forkingBlock.nTime = tMay15-1; // Invalidates PoW
         BOOST_CHECK(!forkingBlock.CheckBlock(state, false, false));
 
         // After May 15'th, big blocks are OK: