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--- a/libupnpp/smallut.cpp
+++ b/libupnpp/smallut.cpp
@@ -1237,9 +1237,10 @@
 public:
     Internal(const string& exp, int flags, int nm)
         : expr(exp,
-               basic_regex<char>::flag_type(regex_constants::extended |
-                   ((flags&SRE_ICASE) ? regex_constants::icase : 0) |
-                   ((flags&SRE_NOSUB) ? regex_constants::nosubs : 0)
+               basic_regex<char>::flag_type(
+                   regex_constants::extended |
+                   ((flags&SRE_ICASE) ? int(regex_constants::icase) : 0) |
+                   ((flags&SRE_NOSUB) ? int(regex_constants::nosubs) : 0)
                    )), ok(true), nmatch(nm) {
     }
     std::regex expr;