diff --git a/dlls/jscript/lex.c b/dlls/jscript/lex.c
index 022c06e1c8b..06d0b89c7d4 100644
--- a/dlls/jscript/lex.c
+++ b/dlls/jscript/lex.c
@@ -16,7 +16,9 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#include <math.h>
+#include "config.h"
+#include "wine/port.h"
+
 #include <limits.h>
 
 #include "jscript.h"