diff --git a/src/popsift/s_filtergrid.cu b/src/popsift/s_filtergrid.cu
index 9e35d8b..9ee93fd 100644
--- a/src/popsift/s_filtergrid.cu
+++ b/src/popsift/s_filtergrid.cu
@@ -17,10 +17,12 @@
 #include <thrust/host_vector.h>
 #include <thrust/iterator/constant_iterator.h>
 #include <thrust/iterator/discard_iterator.h>
+#include <thrust/iterator/zip_iterator.h>
 #include <thrust/sequence.h>
 #include <thrust/sort.h>
 #include <thrust/transform.h>
 #include <thrust/transform_scan.h>
+#include <thrust/tuple.h>
 #include <thrust/version.h>
 
 namespace popsift