diff --git a/doc/Doxyfile b/doc/Doxyfile
index 5ae666e5..a0bce3f0 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -122,7 +122,7 @@ HTML_OUTPUT = html
 HTML_FILE_EXTENSION = .html
 HTML_HEADER = 
 HTML_FOOTER = 
-HTML_EXTRA_STYLESHEET = ..doc/doxy_formula.css
+HTML_EXTRA_STYLESHEET = ../doc/doxy_formula.css
 HTML_ALIGN_MEMBERS = YES
 HTML_EXTRA_FILES = ../doc/fluidsettings.xml ../doc/fluidsettings.xsl
 GENERATE_HTMLHELP = NO