diff --git a/Common/3dParty/html/css/src/xhtml/CDocumentStyle.cpp b/Common/3dParty/html/css/src/xhtml/CDocumentStyle.cpp
index dd5f78d7e6..a7cead51ae 100644
--- a/Common/3dParty/html/css/src/xhtml/CDocumentStyle.cpp
+++ b/Common/3dParty/html/css/src/xhtml/CDocumentStyle.cpp
@@ -3,6 +3,7 @@
 #include <iostream>
 #include <wchar.h>
 #include <math.h>
+#include <cmath>
 #include <algorithm>
 #include <list>