diff --git a/data/test-cases b/data/test-cases
index e0feb82..0423552 100644
--- a/data/test-cases
+++ b/data/test-cases
@@ -26,6 +26,7 @@ saus (tomaat, zout) en water
 saus (tomaat, zout) en pasta, water
 p (a, b), q(c)
 p (a, b (r)), q(c)
+p (E123/E124)
 p: a, b. q: c
 p: a, b. q: c.
 p: e123i-E124
diff --git a/lib/food_ingredient_parser/strict/grammar/list.treetop b/lib/food_ingredient_parser/strict/grammar/list.treetop
index ff204f1..7abad0a 100644
--- a/lib/food_ingredient_parser/strict/grammar/list.treetop
+++ b/lib/food_ingredient_parser/strict/grammar/list.treetop
@@ -4,11 +4,17 @@ module FoodIngredientParser::Strict::Grammar
     include Ingredient
 
     rule list
-      contains:(ingredient ( ws* '|' ws* ingredient )+ ( ws+ and ws+ ingredient )? ) <ListNode> /
-      contains:(ingredient ( ws* ';' ws* ingredient )+ ( ws+ and ws+ ingredient )? ) <ListNode> /
-      contains:(ingredient ( ws* ',' ws* ingredient )+ ( ws+ and ws+ ingredient )? ) <ListNode> /
-      contains:(ingredient ( ws* '.' ws* ingredient )+ ( ws+ and ws+ ingredient )? ) <ListNode> /
-      contains:(ingredient ( ws+ and ws+ ingredient )? )                             <ListNode>
+      contains:(ingredient ( ws* '|' ws* ingredient )+ ( ws+ and ws+ ingredient )? )      <ListNode> /
+      contains:(ingredient ( ws* ';' ws* ingredient )+ ( ws+ and ws+ ingredient )? )      <ListNode> /
+      contains:(ingredient ( ws* ',' ws* ingredient )+ ( ws+ and ws+ ingredient )? )      <ListNode> /
+      contains:(ingredient ( ws* '.' ws* ingredient )+ ( ws+ and ws+ ingredient )? )      <ListNode> /
+      list_e_number /
+      contains:(ingredient ( ws+ and ws+ ingredient )? )                                  <ListNode>
+    end
+
+    rule list_e_number
+      contains:(ingredient_simple_e_number ( ws* '/'  ws* ingredient_simple_e_number )+ ) <ListNode> /
+      contains:(ingredient_simple_e_number ( ws* dash ws* ingredient_simple_e_number )+ ) <ListNode>
     end
   end
 end