diff --git a/PerlMagick/t/filter.t b/PerlMagick/t/filter.t
index 0c85a18..9174d11 100644
--- a/PerlMagick/t/filter.t
+++ b/PerlMagick/t/filter.t
@@ -132,7 +132,7 @@
testFilterCompare('input.miff', q//, 'reference/filter/Negate.miff', 'Negate', q//, 0.0, 0.0);
++$test;
-testFilterCompare('input.miff', q//, 'reference/filter/Normalize.miff', 'Normalize', q//, 0.0, 0.0);
+testFilterCompare('input.miff', q//, 'reference/filter/Normalize.miff', 'Normalize', q//, 0.00004, 0.004);
++$test;
testFilterCompare('input.miff', q//, 'reference/filter/OilPaint.miff', 'OilPaint', q//, 0.03, 1.0);