diff --git a/src/routing/olsr/olsr-header.cc b/src/routing/olsr/olsr-header.cc
index 1bd09a4f3..2a66280b3 100644
--- a/src/routing/olsr/olsr-header.cc
+++ b/src/routing/olsr/olsr-header.cc
@@ -522,7 +522,7 @@ OlsrEmfTestCase::DoRun (void)
     {
       uint8_t emf = olsr::SecondsToEmf (time);
       double seconds = olsr::EmfToSeconds (emf);
-      NS_TEST_ASSERT_MSG_EQ((seconds < 0 || fabs (seconds - time) > 0.1), true,
+      NS_TEST_ASSERT_MSG_EQ((seconds < 0 || fabs (seconds - time) > 0.1), false,
                             "XXX");
     }
   return false;