diff --git a/src/H5BlockF.c b/src/H5BlockF.c
index dc5de0d..70dbc89 100755
--- a/src/H5BlockF.c
+++ b/src/H5BlockF.c
@@ -127,10 +127,20 @@ h5bl_get_reduced_partition_of_proc (
 
 	H5PartFile *filehandle = (H5PartFile*)(size_t)*f;
 
-	return H5Block3dGetReducedPartitionOfProc (
+	h5part_int64_t herr = H5Block3dGetReducedPartitionOfProc (
 		filehandle,
 		*proc,
 		i_start, i_end, j_start, j_end, k_start, k_end );
+	if ( herr < 0 ) return herr;
+
+	(*i_start)++;
+	(*i_end)++;
+	(*j_start)++;
+	(*j_end)++;
+	(*k_start)++;
+	(*k_end)++;
+
+	return H5PART_SUCCESS;
 }
 
 h5part_int64_t
@@ -143,7 +153,7 @@ h5bl_get_proc_of (
 
 	H5PartFile *filehandle = (H5PartFile*)(size_t)*f;
 
-	return H5Block3dGetProcOf ( filehandle, *i, *j, *k );
+	return H5Block3dGetProcOf ( filehandle, (*i)-1, (*j)-1, (*k)-1 );
 }
 
 h5part_int64_t