diff --git a/src/Textamina.Markdig/Extensions/Footnotes/FootnoteParser.cs b/src/Textamina.Markdig/Extensions/Footnotes/FootnoteParser.cs
index 8a96572b..89c6413e 100644
--- a/src/Textamina.Markdig/Extensions/Footnotes/FootnoteParser.cs
+++ b/src/Textamina.Markdig/Extensions/Footnotes/FootnoteParser.cs
@@ -53,7 +53,7 @@ namespace Textamina.Markdig.Extensions.Footnotes
                 Footnote = footnote,
                 CreateLinkInline = CreateLinkToFootnote
             };
-            state.Document.LinkReferenceDefinitions[footnote.Label] = linkRef;
+            state.Document.GetLinkReferenceDefinitions()[footnote.Label] = linkRef;
 
             state.NewBlocks.Push(footnote);
             return BlockState.Continue;
diff --git a/src/Textamina.Markdig/Parsers/Inlines/LinkInlineParser.cs b/src/Textamina.Markdig/Parsers/Inlines/LinkInlineParser.cs
index 89fc2396..70976d89 100644
--- a/src/Textamina.Markdig/Parsers/Inlines/LinkInlineParser.cs
+++ b/src/Textamina.Markdig/Parsers/Inlines/LinkInlineParser.cs
@@ -53,7 +53,7 @@ namespace Textamina.Markdig.Parsers.Inlines
                     // If the label is followed by either a ( or a [, this is not a shortcut
                     if (LinkHelper.TryParseLabel(ref slice, out label))
                     {
-                        if (!state.Document.LinkReferenceDefinitions.ContainsKey(label))
+                        if (!state.Document.GetLinkReferenceDefinitions().ContainsKey(label))
                         {
                             label = null;
                         }
@@ -93,7 +93,7 @@ namespace Textamina.Markdig.Parsers.Inlines
         {
             bool isValidLink = false;
             LinkReferenceDefinition linkRef;
-            if (state.Document.LinkReferenceDefinitions.TryGetValue(label, out linkRef))
+            if (state.Document.GetLinkReferenceDefinitions().TryGetValue(label, out linkRef))
             {
                 Inline link = null;
                 // Try to use a callback directly defined on the LinkReferenceDefinition
diff --git a/src/Textamina.Markdig/Parsers/ParagraphBlockParser.cs b/src/Textamina.Markdig/Parsers/ParagraphBlockParser.cs
index 0cbf8f5d..31456aa4 100644
--- a/src/Textamina.Markdig/Parsers/ParagraphBlockParser.cs
+++ b/src/Textamina.Markdig/Parsers/ParagraphBlockParser.cs
@@ -139,6 +139,7 @@ namespace Textamina.Markdig.Parsers
         {
             bool atLeastOneFound = false;
 
+            var references = state.Document.GetLinkReferenceDefinitions();
             while (true)
             {
                 // If we have found a LinkReferenceDefinition, we can discard the previous paragraph
@@ -146,9 +147,9 @@ namespace Textamina.Markdig.Parsers
                 LinkReferenceDefinition linkReferenceDefinition;
                 if (LinkReferenceDefinition.TryParse(ref iterator, out linkReferenceDefinition))
                 {
-                    if (!state.Document.LinkReferenceDefinitions.ContainsKey(linkReferenceDefinition.Label))
+                    if (!references.ContainsKey(linkReferenceDefinition.Label))
                     {
-                        state.Document.LinkReferenceDefinitions[linkReferenceDefinition.Label] = linkReferenceDefinition;
+                        references[linkReferenceDefinition.Label] = linkReferenceDefinition;
                     }
                     atLeastOneFound = true;
 
diff --git a/src/Textamina.Markdig/Syntax/Document.cs b/src/Textamina.Markdig/Syntax/Document.cs
index b5a41c18..7ba7ae25 100644
--- a/src/Textamina.Markdig/Syntax/Document.cs
+++ b/src/Textamina.Markdig/Syntax/Document.cs
@@ -1,15 +1,9 @@
-using System;
-using System.Collections.Generic;
-
-namespace Textamina.Markdig.Syntax
+namespace Textamina.Markdig.Syntax
 {
     public class Document : ContainerBlock
     {
         public Document() : base(null)
         {
-            LinkReferenceDefinitions = new Dictionary<string, LinkReferenceDefinition>(StringComparer.OrdinalIgnoreCase);
         }
-
-        public Dictionary<string, LinkReferenceDefinition> LinkReferenceDefinitions { get; }
     }
 }
\ No newline at end of file
diff --git a/src/Textamina.Markdig/Syntax/LinkReferenceDefinition.cs b/src/Textamina.Markdig/Syntax/LinkReferenceDefinition.cs
index b060be6b..432123b0 100644
--- a/src/Textamina.Markdig/Syntax/LinkReferenceDefinition.cs
+++ b/src/Textamina.Markdig/Syntax/LinkReferenceDefinition.cs
@@ -6,6 +6,8 @@ namespace Textamina.Markdig.Syntax
 {
     public class LinkReferenceDefinition : LeafBlock
     {
+        public static readonly object DocumentKey = typeof (LinkReferenceDefinition);
+
         public delegate Inline CreateLinkInlineDelegate(InlineParserState inlineState, LinkReferenceDefinition linkRef, Inline child = null);
 
         public LinkReferenceDefinition() : base(null)
diff --git a/src/Textamina.Markdig/Syntax/LinkReferenceDefinitionExtensions.cs b/src/Textamina.Markdig/Syntax/LinkReferenceDefinitionExtensions.cs
new file mode 100644
index 00000000..0d19d74e
--- /dev/null
+++ b/src/Textamina.Markdig/Syntax/LinkReferenceDefinitionExtensions.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+
+namespace Textamina.Markdig.Syntax
+{
+    public static class LinkReferenceDefinitionExtensions
+    {
+        public static Dictionary<string, LinkReferenceDefinition> GetLinkReferenceDefinitions(this Document document)
+        {
+            var references = document.GetData(LinkReferenceDefinition.DocumentKey) as Dictionary<string, LinkReferenceDefinition>;
+            if (references == null)
+            {
+                references = new Dictionary<string, LinkReferenceDefinition>(StringComparer.OrdinalIgnoreCase);
+                document.SetData(LinkReferenceDefinition.DocumentKey, references);
+            }
+            return references;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Textamina.Markdig/Textamina.Markdig.csproj b/src/Textamina.Markdig/Textamina.Markdig.csproj
index 671c076b..0fbe8afd 100644
--- a/src/Textamina.Markdig/Textamina.Markdig.csproj
+++ b/src/Textamina.Markdig/Textamina.Markdig.csproj
@@ -86,6 +86,7 @@
     <Compile Include="Parsers\BlockParserList.cs" />
     <Compile Include="Parsers\IBlockParser.cs" />
     <Compile Include="Renderers\TextRendererBase.cs" />
+    <Compile Include="Syntax\LinkReferenceDefinitionExtensions.cs" />
     <Compile Include="Syntax\MarkdownObject.cs" />
     <Compile Include="Parsers\IMarkdownParser.cs" />
     <Compile Include="Parsers\IDelimiterProcessor.cs" />