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--- a/src/utils/base64.cpp
+++ b/src/utils/base64.cpp
@@ -125,7 +125,7 @@
 	    for (; ii < in.length(); ch = in[ii++])
 		if (!isspace((unsigned char)ch)) {
 		    DPRINT((stderr, "base64_dec: non-white at eod: 0x%x\n", 
-			    (unsigned int)ch));
+			    (unsigned int)((unsigned char)ch)));
 		    // Well, there are bad encoders out there. Let it pass
 		    //return false;
 		}