diff --git a/test/function/arithmetic/sqrt.test.js b/test/function/arithmetic/sqrt.test.js
index 6c46ba737..d5fd39d86 100644
--- a/test/function/arithmetic/sqrt.test.js
+++ b/test/function/arithmetic/sqrt.test.js
@@ -70,7 +70,7 @@ describe('sqrt', function () {
   })
 
   it('should return NaN if input is NaN', function () {
-    assert.strictEqual(sqrt(NaN), NaN)
+    assert(isNaN(sqrt(NaN)))
   })
 
   it('should throw an error when used with a string', function () {
diff --git a/test/function/matrix/partitionSelect.test.js b/test/function/matrix/partitionSelect.test.js
index 01f6b9a46..83c149b47 100644
--- a/test/function/matrix/partitionSelect.test.js
+++ b/test/function/matrix/partitionSelect.test.js
@@ -66,11 +66,11 @@ describe('partitionSelect', function () {
   })
 
   it('should return NaN if any of the inputs contains NaN', function () {
-    assert.strictEqual(partitionSelect([NaN], 0), NaN)
-    assert.strictEqual(partitionSelect([1, NaN], 0), NaN)
-    assert.strictEqual(partitionSelect([NaN, 1], 0), NaN)
-    assert.strictEqual(partitionSelect([1, 3, NaN], 1), NaN)
-    assert.strictEqual(partitionSelect([NaN, NaN, NaN], 1), NaN)
+    assert(isNaN(partitionSelect([NaN], 0)))
+    assert(isNaN(partitionSelect([1, NaN], 0)))
+    assert(isNaN(partitionSelect([NaN, 1], 0)))
+    assert(isNaN(partitionSelect([1, 3, NaN], 1)))
+    assert(isNaN(partitionSelect([NaN, NaN, NaN], 1)))
   })
 
   it('should throw an error if called with a multi dimensional matrix', function () {