diff --git a/include/stdex/string.hpp b/include/stdex/string.hpp
index 4e930aba8..5440db6a8 100644
--- a/include/stdex/string.hpp
+++ b/include/stdex/string.hpp
@@ -1181,9 +1181,8 @@ namespace stdex
 	{
 		stdex_assert(str1);
 		stdex_assert(str2);
-		size_t i;
 		unsigned int a, b;
-		for (i = 0; ; ++i) {
+		for (size_t i = 0; ; ++i) {
 			a = static_cast<unsigned int>(tolower(str1[i]));
 			b = static_cast<unsigned int>(tolower(str2[i]));
 			if (!a && !b) return 0;
@@ -1206,11 +1205,10 @@ namespace stdex
 	{
 		stdex_assert(str1);
 		stdex_assert(str2);
-		size_t i;
 		unsigned int a, b;
 		const auto& ctype1 = std::use_facet<std::ctype<T1>>(locale);
 		const auto& ctype2 = std::use_facet<std::ctype<T2>>(locale);
-		for (i = 0;; ++i) {
+		for (size_t i = 0;; ++i) {
 			a = static_cast<unsigned int>(ctype1.tolower(str1[i]));
 			b = static_cast<unsigned int>(ctype2.tolower(str2[i]));
 			if (!a && !b) return 0;