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--- a/libupnpp/smallut.cpp
+++ b/libupnpp/smallut.cpp
@@ -523,16 +523,13 @@
 {
     string out;
     for (string::size_type pos = 0; pos < in.length(); pos++) {
-        switch (in.at(pos)) {
-        case '<':
-            out += "&lt;";
-            break;
-        case '&':
-            out += "&amp;";
-            break;
-        default:
-            out += in.at(pos);
-        }
+	switch(in.at(pos)) {
+	case '<': out += "&lt;"; break;
+	case '>': out += "&gt;"; break;
+	case '&': out += "&amp;"; break;
+	case '"': out += "&quot;"; break;
+	default: out += in.at(pos); break;
+	}
     }
     return out;
 }