diff --git a/test-suite/prices.cpp b/test-suite/prices.cpp
index 3c7cb6f3851..e2067c00f4e 100644
--- a/test-suite/prices.cpp
+++ b/test-suite/prices.cpp
@@ -133,7 +133,7 @@ BOOST_AUTO_TEST_CASE(testIntervalPriceMakeSeries) {
 
     const TimeSeries<IntervalPrice> priceSeries = createSeries();
 
-    BOOST_TEST(3u == priceSeries.size());
+    BOOST_TEST(3U == priceSeries.size());
     testEquality(priceSeries[{(Day)1, (Month)1, (Year)2001}], {11, 21, 31, 41});
     testEquality(priceSeries[{(Day)2, (Month)2, (Year)2002}], {12, 22, 32, 42});
     testEquality(priceSeries[{(Day)3, (Month)3, (Year)2003}], {13, 23, 33, 43});
@@ -176,7 +176,7 @@ BOOST_AUTO_TEST_CASE(testIntervalPriceExtractComponent) {
         IntervalPrice::extractComponent(createSeries(), IntervalPrice::Low);
 
     for (const auto& series : {openSeries, closeSeries, highSeries, lowSeries})
-        BOOST_TEST(3u == series.size());
+        BOOST_TEST(3U == series.size());
 
     const std::array<Date, 3> expectedDates{Date{(Day)1, (Month)1, (Year)2001},
                                             Date{(Day)2, (Month)2, (Year)2002},
diff --git a/test-suite/timegrid.cpp b/test-suite/timegrid.cpp
index fb6fa46ee03..876c12fa6c4 100644
--- a/test-suite/timegrid.cpp
+++ b/test-suite/timegrid.cpp
@@ -112,7 +112,7 @@ BOOST_AUTO_TEST_CASE(testIndex)
 
     BOOST_CHECK_THROW(tg.index(-2.0), Error);
 
-    BOOST_ASSERT(4u == tg.size());
+    BOOST_ASSERT(4U == tg.size());
 
     BOOST_CHECK_THROW(tg.index(-0.1), Error);
     BOOST_TEST(0 == tg.index(0.0));