1 files changed, 1 insertions, 1 deletions
diff --git a/src/StringUtils.cpp b/src/StringUtils.cpp
index 96fdaeb..9820d29 100644
--- a/src/StringUtils.cpp
+++ b/src/StringUtils.cpp
@@ -103,7 +103,7 @@ namespace QuickMedia {
     size_t str_find_case_insensitive(const std::string &str, size_t start_index, const char *substr, size_t substr_len) {
         auto it = std::search(str.begin() + start_index, str.end(), substr, substr + substr_len,
             [](char c1, char c2) {
-                return std::toupper(c1) == std::toupper(c2);
+                return to_upper(c1) == to_upper(c2);
             });
         if(it == str.end())
             return std::string::npos;