diff --git a/tests/uint32_test.cpp b/tests/uint32_test.cpp
index 663ac3f..99c8fb0 100644
--- a/tests/uint32_test.cpp
+++ b/tests/uint32_test.cpp
@@ -39,7 +39,7 @@ TEST_CASE("uint32_cnt")
 	REQUIRE(16 == bx::uint32_cnttz<uint16_t>(0) );
 	REQUIRE( 0 == bx::uint32_cnttz<uint32_t>(1) );
 	REQUIRE(32 == bx::uint32_cnttz<uint32_t>(0) );
-	REQUIRE(31 == bx::uint32_cnttz<uint32_t>(1<<31) );
+	REQUIRE(31 == bx::uint32_cnttz<uint32_t>(1u<<31) );
 	REQUIRE( 0 == bx::uint32_cnttz<uint64_t>(1) );
 	REQUIRE(64 == bx::uint32_cnttz<uint64_t>(0) );
 
diff --git a/tests/vsnprintf_test.cpp b/tests/vsnprintf_test.cpp
index c218069..775d6d2 100644
--- a/tests/vsnprintf_test.cpp
+++ b/tests/vsnprintf_test.cpp
@@ -181,7 +181,7 @@ TEST_CASE("vsnprintf s")
 
 TEST_CASE("vsnprintf t")
 {
-	size_t size = -1;
+	size_t size = size_t(-1);
 
 	REQUIRE(test("-1", "%td", size) );