diff --git a/unit_tests/tests/test_util.cpp b/unit_tests/tests/test_util.cpp
index 4342d4c9fa..b60e9baa05 100644
--- a/unit_tests/tests/test_util.cpp
+++ b/unit_tests/tests/test_util.cpp
@@ -324,11 +324,11 @@ TEST(misc, testMisc) {
 	}
 	{
 		float v = atoff("nan");
-		ASSERT_TRUE(cisnan(v)) << "NaN atoff";
+		ASSERT_TRUE(std::isnan(v)) << "NaN atoff";
 	}
 	{
 		float v = atoff("N");
-		ASSERT_TRUE(cisnan(v)) << "NaN atoff";
+		ASSERT_TRUE(std::isnan(v)) << "NaN atoff";
 	}
 
 //	ASSERT_EQ(true, strEqual("spa3", getPinName(SPARKOUT_3_OUTPUT)));
diff --git a/unit_tests/tests/trigger/test_trigger_decoder.cpp b/unit_tests/tests/trigger/test_trigger_decoder.cpp
index d5e46656e9..d51f6379f2 100644
--- a/unit_tests/tests/trigger/test_trigger_decoder.cpp
+++ b/unit_tests/tests/trigger/test_trigger_decoder.cpp
@@ -157,9 +157,9 @@ static void testTriggerDecoder2(const char *msg, engine_type_e type, int synchPo
 	ASSERT_FALSE(t->shapeDefinitionError) << "isError";
 
 	ASSERT_EQ(synchPointIndex, t->getTriggerWaveformSynchPointIndex()) << "synchPointIndex";
-	if (!cisnan(expectedGapRatio)) {
+	if (!std::isnan(expectedGapRatio)) {
 		assertEqualsM2("actual gap ratio", expectedGapRatio, initState.triggerSyncGapRatio, 0.001);
-    }
+	}
 }
 
 static void assertREquals(void *expected, void *actual) {