diff --git a/tests/TestSegDist.cpp b/tests/TestSegDist.cpp
index ce3b883d..68bece76 100644
--- a/tests/TestSegDist.cpp
+++ b/tests/TestSegDist.cpp
@@ -47,6 +47,7 @@ int main(int argc, char **argv)
 	Dm.CommInit(MPI_COMM_WORLD);
 
 	nx+=2; ny+=2; nz+=2;
+	N = nx*ny*nz;
 	int count = 0;
 
 	char *id;