diff --git a/rungekutta.h b/rungekutta.h
index 280f67a2acf2d84d4cf9ceb81c6b64b8ac1eea1f..b2347947144cef77ba18c2cf5b95acfc8275856a 100644
--- a/rungekutta.h
+++ b/rungekutta.h
@@ -13,6 +13,10 @@
 #include <fstream>
 #include <string>
 #include <vector>
+#include "newmatap.h"
+#include "newmatio.h"
+
+using namespace NEWMAT;
 
 namespace MISCMATHS {