diff --git a/test/unit/imaging/image_filter.cpp b/test/unit/imaging/image_filter.cpp
index 5329ea4bb..01d6af5d8 100644
--- a/test/unit/imaging/image_filter.cpp
+++ b/test/unit/imaging/image_filter.cpp
@@ -1,4 +1,3 @@
-
 #include "catch.hpp"
 
 // mapnik
@@ -482,7 +481,7 @@ SECTION("test color-blind-protanope") {
 
     CHECK(im(0,0) == 0xff9a4a00);
     CHECK(im(0,1) == 0xff006e7c);
-    CHECK(im(1,0) == 0xffd9f6ff);
+    CHECK(im(1,0) == 0xff00f7ff);
     CHECK(im(1,1) == 0xff1d7e8e);
 
 } // END SECTION
@@ -499,7 +498,7 @@ SECTION("test color-blind-deuteranope") {
 
     CHECK(im(0,0) == 0xff824f00);
     CHECK(im(0,1) == 0xff1c688b);
-    CHECK(im(1,0) == 0xffe9f5ff);
+    CHECK(im(1,0) == 0xff27e9ff);
     CHECK(im(1,1) == 0xff0077a0);
 
 } // END SECTION
@@ -516,7 +515,7 @@ SECTION("test color-blind-tritanope") {
 
     CHECK(im(0,0) == 0xff595500);
     CHECK(im(0,1) == 0xff80763a);
-    CHECK(im(1,0) == 0xfff8f3ff);
+    CHECK(im(1,0) == 0xfffeecff);
     CHECK(im(1,1) == 0xff0017fd);
 
 } // END SECTION