diff --git a/testpar/t_span_tree.c b/testpar/t_span_tree.c
index fe8a618297..8d2b61c4bf 100644
--- a/testpar/t_span_tree.c
+++ b/testpar/t_span_tree.c
@@ -866,6 +866,12 @@ coll_read_test(void)
   }
   VRFY((ret >= 0),"H5D contiguous irregular collective read succeed");
 
+  /*
+   * Free read buffers.
+   */
+  HDfree(matrix_out);
+  HDfree(matrix_out1);
+
   /*
    * Close memory file and memory dataspaces.
    */