diff --git a/test/unit/build.cpp b/test/unit/build.cpp
index 7f418a60..e907b2a1 100644
--- a/test/unit/build.cpp
+++ b/test/unit/build.cpp
@@ -153,14 +153,6 @@ LOLUNIT_FIXTURE(BuildTest)
 
         LOLUNIT_ASSERT_EQUAL(1.0, y);
     }
-
-    LOLUNIT_TEST(IsNaN)
-    {
-        union { float f; uint32_t x; } u;
-
-        u.x = 0x7fc00000u;
-        LOLUNIT_ASSERT(isnan(u.f));
-    }
 };
 
 } /* namespace lol */
diff --git a/test/unit/half.cpp b/test/unit/half.cpp
index 56acd3b9..511a7fc3 100644
--- a/test/unit/half.cpp
+++ b/test/unit/half.cpp
@@ -159,19 +159,13 @@ LOLUNIT_FIXTURE(HalfTest)
         for (uint32_t i = 0; i < 0x10000; i++)
         {
             half h = half::makebits(i);
+            if (h.is_nan())
+                continue;
+
             float f = (float)h;
             half g = (half)f;
             LOLUNIT_SET_CONTEXT(i);
-            if (h.is_nan())
-            {
-                LOLUNIT_ASSERT(isnan(f));
-                LOLUNIT_ASSERT(g.is_nan());
-            }
-            else
-            {
-                LOLUNIT_ASSERT(!isnan(f));
-                LOLUNIT_ASSERT_EQUAL(g.bits, h.bits);
-            }
+            LOLUNIT_ASSERT_EQUAL(g.bits, h.bits);
         }
     }