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--- a/src/bincimapmime/mime-parseonlyheader.cc
+++ b/src/bincimapmime/mime-parseonlyheader.cc
@@ -115,7 +115,7 @@
       if (c == '\n') ++nlines;
       if (c == ':') break;
       if (c == '\n') {
-	for (string::size_type i = name.length() - 1; i >= 0; --i)
+    for (int i = int(name.length()) - 1; i >= 0; --i)
 	  mimeSource->ungetChar();
 
 	quit = true;