diff --git a/src/pineko/theory.py b/src/pineko/theory.py
index fe17d860..492d4f24 100644
--- a/src/pineko/theory.py
+++ b/src/pineko/theory.py
@@ -395,8 +395,9 @@ def fk(self, name, grid_path, tcard, pdf):
         operators = eko.output.Output.load_tar(eko_filename)
         q2_grid = operators["Q2grid"].keys()
         # PineAPPL wants alpha_s = 4*pi*a_s
+        # remember that we already accounted for xif in the opcard generation
         alphas_values = [
-            4.0 * np.pi * astrong.a_s(xir * xir * Q2 / xif / xif) for Q2 in q2_grid
+            4.0 * np.pi * astrong.a_s(xir * xir * Q2) for Q2 in q2_grid
         ]
         # Obtain the assumptions hash
         assumptions = theory_card.construct_assumptions(tcard)