diff --git a/tests/ImageSharp.Tests/Formats/Jpg/ReferenceImplementations.cs b/tests/ImageSharp.Tests/Formats/Jpg/ReferenceImplementations.cs
index c045d89375..a9c87144a5 100644
--- a/tests/ImageSharp.Tests/Formats/Jpg/ReferenceImplementations.cs
+++ b/tests/ImageSharp.Tests/Formats/Jpg/ReferenceImplementations.cs
@@ -362,11 +362,11 @@ namespace ImageSharp.Tests
             float a0, a1, a2, a3, b0, b1, b2, b3;
             float z0, z1, z2, z3, z4;
 
-            float r0 = 1.414214f;
+            //float r0 = 1.414214f;
             float r1 = 1.387040f;
             float r2 = 1.306563f;
             float r3 = 1.175876f;
-            float r4 = 1.000000f;
+            //float r4 = 1.000000f;
             float r5 = 0.785695f;
             float r6 = 0.541196f;
             float r7 = 0.275899f;
@@ -794,7 +794,7 @@ namespace ImageSharp.Tests
             r[7] = 0.275899f;
 
             const float invsqrt2 = 0.707107f; //(float)(1.0f / M_SQRT2);
-            const float invsqrt2h = 0.353554f; //invsqrt2*0.5f;
+            //const float invsqrt2h = 0.353554f; //invsqrt2*0.5f;
 
             c1 = x[0];
             c2 = x[7];
diff --git a/tests/ImageSharp.Tests/project.json b/tests/ImageSharp.Tests/project.json
index cdf1aa61ff..e0e269239e 100644
--- a/tests/ImageSharp.Tests/project.json
+++ b/tests/ImageSharp.Tests/project.json
@@ -12,6 +12,13 @@
   "buildOptions": {
     "allowUnsafe": true
   },
+  "configurations": {
+    "Release": {
+      "buildOptions": {
+        "warningsAsErrors": true
+      }
+    }
+  },
   "dependencies": {
     "ImageSharp": "1.0.0-*",
     "xunit": "2.2.0-*",