diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index 0bfc68ff..98afd49d 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -774,9 +774,13 @@ def add_pipe_retrofit_constraint(n):
     """
     Add constraint for retrofitting existing CH4 pipelines to H2 pipelines.
     """
-    gas_pipes_i = n.links.query("carrier == 'gas pipeline' and p_nom_extendable").index
+    if "reversed" not in n.links.columns:
+        n.links["reversed"] = False
+    gas_pipes_i = n.links.query(
+        "carrier == 'gas pipeline' and p_nom_extendable and ~reversed"
+    ).index
     h2_retrofitted_i = n.links.query(
-        "carrier == 'H2 pipeline retrofitted' and p_nom_extendable"
+        "carrier == 'H2 pipeline retrofitted' and p_nom_extendable and ~reversed"
     ).index
 
     if h2_retrofitted_i.empty or gas_pipes_i.empty: