diff --git a/api/WCharacter.h b/api/WCharacter.h
index 4e83c75b..e3642ccb 100644
--- a/api/WCharacter.h
+++ b/api/WCharacter.h
@@ -145,7 +145,7 @@ inline bool isHexadecimalDigit(int c)
 // ASCII character set, by clearing the high-order bits.
 inline int toAscii(int c)
 {
-  return toascii (c);
+  return (c & 0x7f);
 }