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--- a/src/bincimapmime/mime-printbody.cc
+++ b/src/bincimapmime/mime-printbody.cc
@@ -93,7 +93,7 @@
 {
   mimeSource->reset();
   mimeSource->seek(bodystartoffsetcrlf + startoffset);
-
+  s.reserve(length);
   if (startoffset + length > bodylength)
     length = bodylength - startoffset;