diff --git a/Marlin/src/lcd/anycubic_touchscreen.cpp b/Marlin/src/lcd/anycubic_touchscreen.cpp
index 6f9fc9c0..c5e68e70 100755
--- a/Marlin/src/lcd/anycubic_touchscreen.cpp
+++ b/Marlin/src/lcd/anycubic_touchscreen.cpp
@@ -598,7 +598,7 @@ void AnycubicTouchscreenClass::Ls()
 
         bool hasInvalidCharacter = false;
         for (unsigned char currentChar = 0; currentChar < strlen(card.longFilename); currentChar++)
-        if (!isAscii(card.longFilename[currentChar])) 
+        if (!isPrintable(card.longFilename[currentChar])) 
         {
           hasInvalidCharacter = true;
           break;