diff --git a/config.default.yaml b/config.default.yaml
index c3ee9e87..5c9e4958 100644
--- a/config.default.yaml
+++ b/config.default.yaml
@@ -222,6 +222,9 @@ sector:
   electricity_grid_connection: true  # only applies to onshore wind and utility PV
   gas_network: true
   H2_retrofit: true  # if set to True existing gas pipes can be retrofitted to H2 pipes
+  # according to hydrogen backbone strategy (April, 2020) p.15
+  # https://gasforclimate2050.eu/wp-content/uploads/2020/07/2020_European-Hydrogen-Backbone_Report.pdf
+  # 60% of original natural gas capacity could be used in cost-optimal case as H2 capacity
   H2_retrofit_capacity_per_CH4: 0.6  # ratio for H2 capacity per original CH4 capacity of retrofitted pipelines
   gas_distribution_grid: true
   gas_distribution_grid_cost_factor: 1.0  #multiplies cost in data/costs.csv
diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index 82b451dd..632d916a 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -162,11 +162,13 @@ def add_pipe_retrofit_constraint(n):
     link_p_nom = get_var(n, "Link", "p_nom")
 
     pipe_capacity = n.links.loc[gas_pipes_i, 'p_nom']
-    # according to hydrogen backbone strategy (April, 2020) p.15
-    # https://gasforclimate2050.eu/wp-content/uploads/2020/07/2020_European-Hydrogen-Backbone_Report.pdf
-    # 60% of original natural gas capacity could be used in cost-optimal case as H2 capacity
-    lhs = linexpr((1/0.6, link_p_nom.loc[h2_retrofitted_i].rename(index=lambda x: x.replace("H2 pipeline retrofitted", "Gas pipeline"))),
-                  (1, link_p_nom.loc[gas_pipes_i]))
+
+    CH4_per_H2 = 1 / n.config["sector"]["H2_retrofit_capacity_per_CH4"]
+
+    lhs = linexpr(
+        (CH4_per_H2, link_p_nom.loc[h2_retrofitted_i].rename(index=lambda x: x.replace("H2 pipeline retrofitted", "Gas pipeline"))),
+        (1, link_p_nom.loc[gas_pipes_i])
+    )
 
     define_constraints(n, lhs, "=", pipe_capacity, 'Link', 'pipe_retrofit')