diff --git a/tests/validate.h b/tests/validate.h
index f09f5d8..d5251c0 100644
--- a/tests/validate.h
+++ b/tests/validate.h
@@ -253,7 +253,7 @@
     { "DNG", UndefinedCompression, 0.0 },
     { "DOT", UndefinedCompression, 0.0 },
     { "DPS", UndefinedCompression, 0.0 },
-    { "DPX", UndefinedCompression, 0.0 },
+    { "DPX", UndefinedCompression, 0.003 },
     { "ERF", UndefinedCompression, 0.0 },
     { "EXR", UndefinedCompression, 0.0 },
     { "FITS", UndefinedCompression, 0.003 },