diff --git a/src/libnml/inifile/inifile.hh b/src/libnml/inifile/inifile.hh
index 4da9aae..e419154 100644
--- a/src/libnml/inifile/inifile.hh
+++ b/src/libnml/inifile/inifile.hh
@@ -16,6 +16,7 @@
 #ifndef INIFILE_HH
 #define INIFILE_HH
 
+#include <cmath>
 #include <inifile.h>
 #include <string>
 #include <boost/lexical_cast.hpp>