diff --git a/lib/nutriscore/fr/positive_score.rb b/lib/nutriscore/fr/positive_score.rb
index 7091067..3e33575 100644
--- a/lib/nutriscore/fr/positive_score.rb
+++ b/lib/nutriscore/fr/positive_score.rb
@@ -41,6 +41,10 @@ def proteins
           end
         end
       end
+
+      def score_without_proteins
+        (self.class.nutrient_keys - [:proteins]).map(&method(:public_send)).compact.reduce(&:+)
+      end
     end
   end
 end
diff --git a/spec/nutriscore/fr/specific_score_spec.rb b/spec/nutriscore/fr/specific_score_spec.rb
index 9e45b1c..44a9cff 100644
--- a/spec/nutriscore/fr/specific_score_spec.rb
+++ b/spec/nutriscore/fr/specific_score_spec.rb
@@ -57,4 +57,20 @@
     its(:score) { is_expected.to eq(-2) }
     its(:score_class) { is_expected.to eq 'A' }
   end
+
+  # https://www.willys.se/produkt/Kottbullar-Mammas-100084061_ST
+  # a Questionmark researcher manually computed the scores
+  context 'Köttbullar Mammas (score without proteins)' do
+    let(:nutrients) {{
+      energy: 900,                        # kJ/100g
+      fat_saturated: 6,                   #  g/100g
+      sugar: 1,                           #  g/100g
+      fvnp: 0..40,                        #  g/100g (= weight-%) - manual estimate
+      fibres: 0.3,                        #  g/100g
+      proteins: 13,                       #  g/100g
+      sodium: 0.64,                       #  g/100g
+    }}
+    its(:score) { is_expected.to eq(14) }
+    its(:score_class) { is_expected.to eq 'D' }
+  end
 end