diff --git a/src/util/CharUtil.hxx b/src/util/CharUtil.hxx
index 8fb2f81ad..d599269bc 100644
--- a/src/util/CharUtil.hxx
+++ b/src/util/CharUtil.hxx
@@ -97,6 +97,12 @@ IsAlphaNumericASCII(char ch) noexcept
 	return IsAlphaASCII(ch) || IsDigitASCII(ch);
 }
 
+constexpr bool
+IsUpperAlphaNumericASCII(char ch) noexcept
+{
+	return IsUpperAlphaASCII(ch) || IsDigitASCII(ch);
+}
+
 constexpr bool
 IsLowerAlphaNumericASCII(char ch) noexcept
 {