diff --git a/test/unittest/pointertest.cpp b/test/unittest/pointertest.cpp
index dbddbed..eed6fba 100644
--- a/test/unittest/pointertest.cpp
+++ b/test/unittest/pointertest.cpp
@@ -441,8 +441,8 @@ TEST(Pointer, Stringify) {
 }
 
 // Construct a Pointer with static tokens, no dynamic allocation involved.
-#define NAME(s) { s, sizeof(s) / sizeof(s[0]) - 1, kPointerInvalidIndex }
-#define INDEX(i) { #i, sizeof(#i) - 1, i }
+#define NAME(s) { s, static_cast<SizeType>(sizeof(s) / sizeof(s[0]) - 1), kPointerInvalidIndex }
+#define INDEX(i) { #i, static_cast<SizeType>(sizeof(#i) - 1), i }
 
 static const Pointer::Token kTokens[] = { NAME("foo"), INDEX(0) }; // equivalent to "/foo/0"