Prevent automatic line breaks in a <code> tag

The problem was caused by twitter bootstrap. For whatever reason, they added the following styles to the code tag:

white-space:pre;
white-space:pre-wrap;
word-break:break-all;
word-wrap:break-word;

By overwriting the styles with:

white-space: pre;
word-break: normal;
word-wrap: normal;

The problem was fixed.