--- /QuotedPrintableCodec.java	2023-07-05 02:20:43.586125533 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/net/QuotedPrintableCodec.java	2023-07-05 02:20:43.586125533 +0200
@@ -148,7 +148,7 @@
             if (b < 0) {
                 b = 256 + b;
             }
-            if (printable.get(b)) {
+if  ( PRINTABLE_CHARS.get ( b )  )  {
                 buffer.write(b);
             } else {
                 encodeQuotedPrintable(b, buffer);
