diff --git a/src/GridBasic.cpp b/src/GridBasic.cpp
index 85714af..2e55ace 100644
--- a/src/GridBasic.cpp
+++ b/src/GridBasic.cpp
@@ -1,6 +1,13 @@
 #include <valarray>
 
+#include "CCfits/FITS.h"
+#include "CCfits/FITSUtilT.h"
+#include "CCfits/FitsError.h"
+#include "CCfits/KeyData.h"
 #include "CCfits/PHDU.h"
+#include "CCfits/PHDUT.h"
+#include "fitsio.h"
+
 #include "GridBasic.hpp"