diff --git a/deps/libgdal/gdal/ogr/ogrsf_frmts/shape/shptree.c b/deps/libgdal/gdal/ogr/ogrsf_frmts/shape/shptree.c
index b6f1b85..0720a15 100644
--- a/deps/libgdal/gdal/ogr/ogrsf_frmts/shape/shptree.c
+++ b/deps/libgdal/gdal/ogr/ogrsf_frmts/shape/shptree.c
@@ -35,6 +35,7 @@
  *******************************************************************************/
 
 #include "shapefil.h"
+#include "cpl_port.h"
 
 #include <math.h>
 #include <assert.h>