diff --git a/snippets/c.lua b/snippets/c.lua
index a8d1e6a..f06b791 100644
--- a/snippets/c.lua
+++ b/snippets/c.lua
@@ -6,6 +6,7 @@ local text = luasnip.text_node
 local insert = luasnip.insert_node
 local func = luasnip.function_node
 local choice = luasnip.choice_node
+local dynamic = luasnip.dynamic_node
 local restore = luasnip.restore_node
 local snip = luasnip.snippet_node
 local key = require("luasnip.nodes.key_indexer").new_key
@@ -27,23 +28,22 @@ local snippets = {
 
   snippet('once', {
     text('#ifndef '),
-    func(function(args)
-      return args[1][1]
-    end, key('name')),
+    func(function(opts)
+      return opts[1][1]
+    end, key('guard')),
     text({ '', '#define ' }),
-    insert(1, getIncludeGuardName(), { key = 'name' }),
-    -- FIXME: dynamic(1, function(_, _)
-    --   return snip(nil, {
-    --     insert(1, getIncludeGuardName())
-    --   })
-    -- end, { key = "name" }),
+    dynamic(1, function()
+      return snip(nil, {
+        insert(1, getIncludeGuardName(), { key = 'guard' }),
+      })
+    end),
     text({ '', '', '', }),
     insert(0, ''),
     text({ '', '', '#endif  // ' }),
-    func(function(args)
-      return args[1][1]
-    end, key('name')),
-  }),
+    func(function(opts)
+      return opts[1][1]
+    end, key('guard')),
+  }, {}),
 
 }