diff --git a/pyopencl/algorithm.py b/pyopencl/algorithm.py
index 152fa3a5618d14c4ffad9604196a8d8e97432d0c..73d87154ea4d8a5b17ba09b6c2c1d404a0dd53cc 100644
--- a/pyopencl/algorithm.py
+++ b/pyopencl/algorithm.py
@@ -651,7 +651,9 @@ void ${kernel_name}(${kernel_list_arg_decl} USER_ARG_DECL index_type n)
                     if (plb_${name}_start_index)
                         %if eliminate_empty_output_lists:
                             plb_${name}_index =
-                            plb_${name}_start_index[${name}_compressed_indices[i]];
+                                plb_${name}_start_index[
+                                    ${name}_compressed_indices[i]
+                                ];
                         %else:
                             plb_${name}_index = plb_${name}_start_index[i];
                         %endif