diff --git a/doc/common/doxygen.css b/doc/common/doxygen.css
index 932e6975a..c56c0e91a 100644
--- a/doc/common/doxygen.css
+++ b/doc/common/doxygen.css
@@ -98,6 +98,7 @@ SPAN.charliteral   { color: #008080 }
 .line {
 text-align: left;
 font-family: monospace;
+white-space: pre;
 }
 
 .lineno {