diff --git a/tests/OpenTK.Tests/Assertions.fs b/tests/OpenTK.Tests/Assertions.fs
index 62c9171f..68eb2759 100644
--- a/tests/OpenTK.Tests/Assertions.fs
+++ b/tests/OpenTK.Tests/Assertions.fs
@@ -9,7 +9,7 @@ open OpenTK
 [<AutoOpen>]
 module private AssertHelpers =
     [<Literal>]
-    let private BitAccuracy = 10
+    let private BitAccuracy = 13
 
     let approxEq a b = MathHelper.ApproximatelyEqual(a,b,BitAccuracy)