diff --git a/lib/liquid/block.rb b/lib/liquid/block.rb
index e0ad332..e6dac4d 100644
--- a/lib/liquid/block.rb
+++ b/lib/liquid/block.rb
@@ -28,8 +28,8 @@ module Liquid
       @body.nodelist
     end
 
-    def unknown_tag(tag, _params, _tokens)
-      Block.raise_unknown_tag(tag, block_name, block_delimiter, parse_context)
+    def unknown_tag(tag_name, _markup, _tokenizer)
+      Block.raise_unknown_tag(tag_name, block_name, block_delimiter, parse_context)
     end
 
     # @api private
diff --git a/lib/liquid/document.rb b/lib/liquid/document.rb
index e0818ec..2e47ffb 100644
--- a/lib/liquid/document.rb
+++ b/lib/liquid/document.rb
@@ -19,16 +19,15 @@ module Liquid
       @body.nodelist
     end
 
-    def parse(tokens, parse_context)
-      @body.parse(tokens, parse_context) do |end_tag_name, _end_tag_params|
-        unknown_tag(end_tag_name, parse_context) if end_tag_name
+    def parse(tokenizer, parse_context)
+      while parse_body(tokenizer)
       end
     rescue SyntaxError => e
       e.line_number ||= parse_context.line_number
       raise
     end
 
-    def unknown_tag(tag, parse_context)
+    def unknown_tag(tag, _markup, _tokenizer)
       case tag
       when 'else', 'end'
         raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_outer_tag", tag: tag)
@@ -50,5 +49,16 @@ module Liquid
     def new_body
       parse_context.new_block_body
     end
+
+    def parse_body(tokenizer)
+      @body.parse(tokenizer, parse_context) do |unknown_tag_name, unknown_tag_markup|
+        if unknown_tag_name
+          unknown_tag(unknown_tag_name, unknown_tag_markup, tokenizer)
+          true
+        else
+          false
+        end
+      end
+    end
   end
 end