diff --git a/src/core/PieceTable.cc b/src/core/PieceTable.cc
index ddfb9ca..cfce928 100644
--- a/src/core/PieceTable.cc
+++ b/src/core/PieceTable.cc
@@ -401,10 +401,17 @@ void PieceTable::insertion_test(Cursor & c)
         change->new_link[1][1] = end_piece;
     }
 
-    change->new_link[0][0]->next = change->new_link[0][1];
-    change->new_link[0][1]->prev = change->new_link[0][0];
-    change->new_link[1][0]->next = change->new_link[1][1];
-    change->new_link[1][1]->prev = change->new_link[1][0];
+    apply_change(change, 0u);
 
     c.warp_to_inserted_piece(piece);
 }
+
+void PieceTable::apply_change(Change * change, uint8_t reverse)
+{
+    uint8_t i1 = reverse;
+    uint8_t i2 = reverse ^ 1u;
+    change->new_link[i1][i1]->next = change->new_link[i1][i2];
+    change->new_link[i1][i2]->prev = change->new_link[i1][i1];
+    change->new_link[i2][i1]->next = change->new_link[i2][i2];
+    change->new_link[i2][i2]->prev = change->new_link[i2][i1];
+}
diff --git a/src/core/PieceTable.h b/src/core/PieceTable.h
index 46a670b..e9cdde2 100644
--- a/src/core/PieceTable.h
+++ b/src/core/PieceTable.h
@@ -164,6 +164,8 @@ public:
 
     void insertion_test(Cursor & c);
 
+    void apply_change(Change * change, uint8_t reverse);
+
 protected:
     const uint8_t * m_file_buffer;
     unsigned long m_file_buffer_size;