diff --git a/python/slope.py b/python/slope.py
index 118af55..35d292c 100644
--- a/python/slope.py
+++ b/python/slope.py
@@ -128,8 +128,10 @@ class Inspector(object):
   int seedTilePoint = %(seed)d;
   insp_run (insp, seedTilePoint);
 
-  %(output_insp)s
-  %(output_vtk)s
+  if (rank == 0) {
+    %(output_insp)s
+    %(output_vtk)s
+  }
 
   executor_t* exec = exec_init (insp);
   insp_free (insp);