diff --git a/Marlin/src/lcd/extui/knutwurst/anycubic_touchscreen.cpp b/Marlin/src/lcd/extui/knutwurst/anycubic_touchscreen.cpp
index 3467ddd5..f4407f75 100755
--- a/Marlin/src/lcd/extui/knutwurst/anycubic_touchscreen.cpp
+++ b/Marlin/src/lcd/extui/knutwurst/anycubic_touchscreen.cpp
@@ -924,9 +924,9 @@ void AnycubicTouchscreenClass::RenderCurrentFolder(uint16_t selectedNumber) {
           fileNameWasCut = true;
           fileNameLen    = MAX_PRINTABLE_FILENAME_LEN;
         }
-        char outputString[MAX_PRINTABLE_FILENAME_LEN];
+        char outputString[MAX_PRINTABLE_FILENAME_LEN] = {'\0'};
       #else
-        char outputString[fileNameLen];
+        char outputString[fileNameLen] = {'\0'};
       #endif
 
       // Bugfix for non-printable special characters