diff --git a/src/libraries/System.Text.RegularExpressions/gen/RegexGenerator.Emitter.cs b/src/libraries/System.Text.RegularExpressions/gen/RegexGenerator.Emitter.cs
index 41fed7b690713..734f3509f3843 100644
--- a/src/libraries/System.Text.RegularExpressions/gen/RegexGenerator.Emitter.cs
+++ b/src/libraries/System.Text.RegularExpressions/gen/RegexGenerator.Emitter.cs
@@ -3419,8 +3419,8 @@ private static string MatchCharacterClass(bool hasTextInfo, RegexOptions options
             // characters other than that some might be included, for example if the character class
             // were [\w\d], so since ch >= 128, we need to fall back to calling CharInClass.
             return invariant ?
-                $"((ch = {chExpr}) < 128 ? ({Literal(bitVectorString)}[ch >> 4] & (1 << (ch & 0xF))) != 0 : CharInClass(char.ToLowerInvariant((char)ch), {Literal(charClass)}))" :
-                $"((ch = {chExpr}) < 128 ? ({Literal(bitVectorString)}[ch >> 4] & (1 << (ch & 0xF))) != 0 : CharInClass((char)ch, {Literal(charClass)}))";
+                $"((ch = {chExpr}) < 128 ? ({Literal(bitVectorString)}[ch >> 4] & (1 << (ch & 0xF))) != 0 : global::System.Text.RegularExpressions.RegexRunner.CharInClass(char.ToLowerInvariant((char)ch), {Literal(charClass)}))" :
+                $"((ch = {chExpr}) < 128 ? ({Literal(bitVectorString)}[ch >> 4] & (1 << (ch & 0xF))) != 0 : global::System.Text.RegularExpressions.RegexRunner.CharInClass((char)ch, {Literal(charClass)}))";
         }
 
         private static string Literal(char c) => SymbolDisplay.FormatLiteral(c, quote: true);