diff --git a/6502/C64/tests/run-vf-tests.fth b/6502/C64/tests/run-vf-tests.fth
index d41d57e..6eb98f8 100644
--- a/6502/C64/tests/run-vf-tests.fth
+++ b/6502/C64/tests/run-vf-tests.fth
@@ -7,4 +7,4 @@ include tester.fth
 
 1 verbose !
 
-include core.fth
+include core.fr