diff --git a/layout/reftests/css-gradients/reftest.list b/layout/reftests/css-gradients/reftest.list
index 0e54b973b23..eb51eedc4c5 100644
--- a/layout/reftests/css-gradients/reftest.list
+++ b/layout/reftests/css-gradients/reftest.list
@@ -115,7 +115,7 @@ fuzzy-if(d2d,127,2612) == repeating-radial-1e.html repeating-radial-1-ref.html
 
 # from http://www.xanthir.com/:4bhipd by way of http://a-ja.net/newgrad.html
 fuzzy-if(!contentSameGfxBackendAsCanvas,1,20000) fuzzy-if(azureSkiaGL,8,20000) fuzzy-if(azureQuartz&&OSX==1006,1,4646) == aja-linear-1a.html aja-linear-1-ref.html
-fails-if(!d2d) == aja-linear-1b.html aja-linear-1-ref.html # bug 526694
+fails-if(!d2d&&!(OSX==1010&&isDebugBuild)) == aja-linear-1b.html aja-linear-1-ref.html # bug 526694, passing on 10.10 debug is bug 1128517
 fuzzy-if(!contentSameGfxBackendAsCanvas,1,20000) fuzzy-if(azureSkiaGL,8,20000) fuzzy-if(azureQuartz&&OSX==1006,1,4646) == aja-linear-1c.html aja-linear-1-ref.html
 fuzzy-if(!contentSameGfxBackendAsCanvas,1,20000) fuzzy-if(azureSkiaGL,8,20000) fuzzy-if(azureQuartz&&OSX==1006,1,4646) == aja-linear-1d.html aja-linear-1-ref.html
 fuzzy-if(!contentSameGfxBackendAsCanvas,1,20000) fuzzy-if(azureSkiaGL,8,20000) fuzzy-if(azureQuartz&&OSX==1006,1,4646) == aja-linear-1e.html aja-linear-1-ref.html