diff --git a/src/ekobox/evol_pdf.py b/src/ekobox/evol_pdf.py
index 94c8e416c..4310a0eda 100644
--- a/src/ekobox/evol_pdf.py
+++ b/src/ekobox/evol_pdf.py
@@ -60,12 +60,16 @@ def evolve_pdfs(
 
     # apply PDF to eko
     evolved_PDF_list = []
+    q2block_per_nf = {}
     with EKO.read(eko_path) as eko_output:
         for initial_PDF in initial_PDF_list:
             evolved_PDF_list.append(
                 apply.apply_pdf(eko_output, initial_PDF, targetgrid)
             )
 
+        # separate by nf the evolgrid (and order per nf/q)
+        q2block_per_nf = regroup_evolgrid(eko_output.evolgrid)  # pylint: disable=E1101
+
     # update info file
     if targetgrid is None:
         targetgrid = operators_card.xgrid
@@ -80,9 +84,6 @@ def evolve_pdfs(
         info_update=info_update,
     )
 
-    # separate by nf the evolgrid (and order per nf/q)
-    q2block_per_nf = regroup_evolgrid(eko_output.evolgrid)
-
     # write all replicas
     all_member_blocks = []
     for evolved_PDF in evolved_PDF_list: