diff --git a/include/duckhandy/implem/int_conv.hpp b/include/duckhandy/implem/int_conv.hpp
index 7d717be..276238d 100644
--- a/include/duckhandy/implem/int_conv.hpp
+++ b/include/duckhandy/implem/int_conv.hpp
@@ -286,7 +286,7 @@ namespace dhandy {
 		}
 	};
 	template <typename C>
-	using ASCIITranslatorUpcase = ASCIITranslator<C, 'A'>;
+	using ASCIITranslatorUpcase = ASCIITranslator<C, '0', 'A'>;
 
 	template <typename I, unsigned int Base=10, typename Tr=ASCIITranslator<char>>
 	constexpr inline auto int_to_ary (I in) {
diff --git a/test/unit/int_conv_test.cpp b/test/unit/int_conv_test.cpp
index 26be172..6145328 100644
--- a/test/unit/int_conv_test.cpp
+++ b/test/unit/int_conv_test.cpp
@@ -34,6 +34,12 @@ namespace {
 		using AryConversion = dhandy::implem::AryConversion<T, Base, dhandy::ASCIITranslator<char>>;
 		CHECK(AryConversion::from_ary(s.data(), s.data() + s.size()) == expected);
 	}
+
+	template <typename T, unsigned int Base>
+	void AryConversionTestHelperUp (const std::string_view& s, T expected) {
+		using AryConversion = dhandy::implem::AryConversion<T, Base, dhandy::ASCIITranslatorUpcase<char>>;
+		CHECK(AryConversion::from_ary(s.data(), s.data() + s.size()) == expected);
+	}
 } //unnamed namespace
 
 TEST_CASE ("Check int to char array conversions", "[s2i][int_conv]") {
@@ -74,6 +80,7 @@ TEST_CASE ("Check int to char array conversions", "[s2i][int_conv]") {
 	CHECK(int_to_ary<int64_t>(-1) == "-1");
 	CHECK(int_to_ary<int64_t>(0x1000000000000000) == "1152921504606846976");
 	CHECK(int_to_ary<int64_t>(0xF000000000000000) == "-1152921504606846976");
+	CHECK(int_to_ary<int, 16, dhandy::ASCIITranslatorUpcase<char>>(255) == "FF");
 
 	CHECK(int_to_ary<uint16_t SPROUT_PP_COMMA() 16>(0xFFFF) == "ffff");
 	CHECK(int_to_ary<uint16_t SPROUT_PP_COMMA() 16>(0xCACA) == "caca");
@@ -155,6 +162,7 @@ TEST_CASE ("Check char array to int conversions", "[i2s][int_conv]") {
 	AryConversionTestHelper<int32_t, 16>("7fffffff", 0x7fffffff);
 	AryConversionTestHelper<bool, 10>("1", true);
 	AryConversionTestHelper<bool, 10>("0", false);
+	AryConversionTestHelperUp<uint64_t, 16>("ABCDEF123456ABCD", 0xabcdef123456abcd);
 
 	AryConversionTestHelper<signed int, 10>("-1", -1);
 	AryConversionTestHelper<signed int, 10>("-50000", -50000);