diff --git a/modules/juce_osc/osc/juce_OSCAddress.cpp b/modules/juce_osc/osc/juce_OSCAddress.cpp
index 99e1358de6d5..8b6540ff89bc 100644
--- a/modules/juce_osc/osc/juce_OSCAddress.cpp
+++ b/modules/juce_osc/osc/juce_OSCAddress.cpp
@@ -283,14 +283,17 @@ namespace
             return c >= ' ' && c <= '~';
         }
 
-        static bool isDisallowedChar (juce_wchar c) noexcept
-        {
 #if JUCE_ALLOW_SPECIAL_CHARS_IN_ADDRESS 
+        static bool isDisallowedChar (juce_wchar) noexcept
+        {
             return false;
+        }
 #else 
-            return CharPointer_ASCII( Traits::getDisallowedChars()).indexOf (c, false) >= 0;
-#endif 
+        static bool isDisallowedChar(juce_wchar c) noexcept
+        {
+            return CharPointer_ASCII(Traits::getDisallowedChars()).indexOf(c, false) >= 0;
         }
+#endif 
 
         static bool containsOnlyAllowedPrintableASCIIChars (const String& string) noexcept
         {