diff --git a/nnpdf_data/nnpdf_data/commondata/ATLAS_WPWM_13TEV/filter.py b/nnpdf_data/nnpdf_data/commondata/ATLAS_WPWM_13TEV/filter.py
index 70327a496f..512d5a1d30 100644
--- a/nnpdf_data/nnpdf_data/commondata/ATLAS_WPWM_13TEV/filter.py
+++ b/nnpdf_data/nnpdf_data/commondata/ATLAS_WPWM_13TEV/filter.py
@@ -57,7 +57,7 @@ def filter_ATLAS_WPWM_13TEV_TOT_systematics():
         elif sys[0]['name'] == 'ATLAS_LUMI':
             error_definitions["ATLASLUMI13"] = {
                 "description": f"ATLASLUMI13",
-                "treatment": "ADD",
+                "treatment": "MULT",
                 "type": "ATLASLUMI13",
             }
 
diff --git a/nnpdf_data/nnpdf_data/commondata/ATLAS_WPWM_13TEV/uncertainties.yaml b/nnpdf_data/nnpdf_data/commondata/ATLAS_WPWM_13TEV/uncertainties.yaml
index 593bd2816e..e57bb9f4bb 100644
--- a/nnpdf_data/nnpdf_data/commondata/ATLAS_WPWM_13TEV/uncertainties.yaml
+++ b/nnpdf_data/nnpdf_data/commondata/ATLAS_WPWM_13TEV/uncertainties.yaml
@@ -17,7 +17,7 @@ definitions:
     type: UNCORR
   ATLASLUMI13:
     description: ATLASLUMI13
-    treatment: ADD
+    treatment: MULT
     type: ATLASLUMI13
 bins:
 - ATLAS_WZ_TOT_13TEV_0: 6.80483165e+04
diff --git a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_13TEV/filter.py b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_13TEV/filter.py
index 49636e4af6..1ccca1ede4 100644
--- a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_13TEV/filter.py
+++ b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_13TEV/filter.py
@@ -65,7 +65,7 @@ def filter_ATLAS_Z0_13TEV_TOT_systematics():
         elif sys[0]['name'] == 'ATLAS_LUMI':
             error_definitions["ATLASLUMI13"] = {
                 "description": f"ATLASLUMI13",
-                "treatment": "ADD",
+                "treatment": "MULT",
                 "type": "ATLASLUMI13",
             }
 
diff --git a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_13TEV/uncertainties.yaml b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_13TEV/uncertainties.yaml
index cc0a377eb2..485c31e9e7 100644
--- a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_13TEV/uncertainties.yaml
+++ b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_13TEV/uncertainties.yaml
@@ -17,7 +17,7 @@ definitions:
     type: UNCORR
   ATLASLUMI13:
     description: ATLASLUMI13
-    treatment: ADD
+    treatment: MULT
     type: ATLASLUMI13
 bins:
 - ATLAS_WZ_TOT_13TEV_0: 1.13953999e+03