diff --git a/modules/juce_core/text/juce_CharPointer_UTF8.h b/modules/juce_core/text/juce_CharPointer_UTF8.h
index 475d84e4d5..6b65c245f8 100644
--- a/modules/juce_core/text/juce_CharPointer_UTF8.h
+++ b/modules/juce_core/text/juce_CharPointer_UTF8.h
@@ -449,7 +449,7 @@ public:
     }
 
     /** Returns true if the first character of this string is whitespace. */
-    bool isWhitespace() const noexcept          { const CharType c = *data; return c == ' ' || (c <= 13 && c >= 9); }
+    bool isWhitespace() const noexcept          { return CharacterFunctions::isWhitespace ((juce_wchar) *(*this)); }
     /** Returns true if the first character of this string is a digit. */
     bool isDigit() const noexcept               { const CharType c = *data; return c >= '0' && c <= '9'; }
     /** Returns true if the first character of this string is a letter. */