diff --git a/source/s11n/worksheet_serializer.cpp b/source/s11n/worksheet_serializer.cpp
index f6d8087e..255383b3 100644
--- a/source/s11n/worksheet_serializer.cpp
+++ b/source/s11n/worksheet_serializer.cpp
@@ -1,3 +1,4 @@
+#include <cmath>
 #include <sstream>
 
 #include <xlnt/s11n/worksheet_serializer.hpp>