diff --git a/tests/validate.h b/tests/validate.h
index cfaf130..2d67837 100644
--- a/tests/validate.h
+++ b/tests/validate.h
@@ -343,7 +343,7 @@
     { "UYVY", UndefinedCompression, 0.0 },
     { "VDA", UndefinedCompression, 0.0 },
     { "VICAR", UndefinedCompression, 0.0 },
-    { "VIFF", UndefinedCompression, 0.0 },
+    { "VIFF", UndefinedCompression, 0.004 },
     { "VST", UndefinedCompression, 0.0 },
     { "WBMP", UndefinedCompression, 0.0 },
     { "WPG", UndefinedCompression, 0.0 },