diff --git a/src/sage/graphs/generic_graph_pyx.pyx b/src/sage/graphs/generic_graph_pyx.pyx
index f20adecff30..720177ce6c8 100644
--- a/src/sage/graphs/generic_graph_pyx.pyx
+++ b/src/sage/graphs/generic_graph_pyx.pyx
@@ -1321,7 +1321,7 @@ def transitive_reduction_acyclic(G):
         for vv in G.neighbors_out(uu):
             v = v_to_int[vv]
             binary_matrix_set1(closure, u, v)
-        bitset_or(closure.rows+u, closure.rows+u, closure.rows+v)
+            bitset_or(closure.rows+u, closure.rows+u, closure.rows+v)
 
     # Build the transitive reduction of G
     #
@@ -1333,7 +1333,7 @@ def transitive_reduction_acyclic(G):
         u = v_to_int[uu]
         for vv in G.neighbors_out(uu):
             v = v_to_int[vv]
-        bitset_difference(closure.rows+u, closure.rows+u, closure.rows+v)
+            bitset_difference(closure.rows+u, closure.rows+u, closure.rows+v)
         for vv in G.neighbors_out(uu):
             v = v_to_int[vv]
             if binary_matrix_get(closure, u, v):