diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index 0f6725c7..b1463b35 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -543,7 +543,7 @@ def add_BAU_constraints(n, config):
     ext_carrier_i = xr.DataArray(ext_i.carrier.rename_axis("Generator-ext"))
     lhs = p_nom.groupby(ext_carrier_i).sum()
     index = mincaps.index.intersection(lhs.indexes["carrier"])
-    rhs = mincaps[index].rename_axis("carrier")
+    rhs = mincaps[lhs.indexes["carrier"]].rename_axis("carrier")
     n.model.add_constraints(lhs >= rhs, name="bau_mincaps")