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--- a/src/bincimapmime/convert.cc
+++ b/src/bincimapmime/convert.cc
@@ -47,7 +47,7 @@
 }
 
 //------------------------------------------------------------------------
-string BincStream::popString(unsigned int size)
+string BincStream::popString(std::string::size_type size)
 {
   if (size > nstr.length())
     size = nstr.length();