diff --git a/tests/testprec.h b/tests/testprec.h
index ea35d991ab..e5411af333 100644
--- a/tests/testprec.h
+++ b/tests/testprec.h
@@ -4,7 +4,8 @@
 #include "wx/wxprec.h"
 #include "wx/evtloop.h"
 
-// This needs to be included before catch.hpp to be taken into account.
+// These headers must be included before catch.hpp to be taken into account.
+#include "asserthelper.h"
 #include "testdate.h"
 
 // This needs to be defined before including catch.hpp for PCH support.