diff --git a/source/structs/package.d b/source/structs/package.d
index b3b920f..cf6e3ce 100644
--- a/source/structs/package.d
+++ b/source/structs/package.d
@@ -396,24 +396,39 @@ public
 
 private
 {
+	size_t test_size(string FORMAT)()
+	{
+		size_t result = BaseFormat!FORMAT.size();
+		{
+			auto tmp = parse_string(FORMAT);
+			size_t calced = 0;
+			foreach(i; tmp)
+			{
+				calced += i.packSize();
+			}
+			assert(result == calced);
+		}
+		return result;
+	}
+
 	unittest
 	{
-		assert(BaseFormat!"10s".size() == 10);
-		assert(BaseFormat!"b".size() == 1);
-		assert(BaseFormat!"4b".size() == 4);
-		assert(BaseFormat!"B".size() == 1);
-		assert(BaseFormat!"4B".size() == 4);
-		assert(BaseFormat!"h".size() == 2);
-		assert(BaseFormat!"4h".size() == 8);
-		assert(BaseFormat!"H".size() == 2);
-		assert(BaseFormat!"4H".size() == 8);
-		assert(BaseFormat!"i".size() == 4);
-		assert(BaseFormat!"4i".size() == 16);
-		assert(BaseFormat!"I".size() == 4);
-		assert(BaseFormat!"4I".size() == 16);
-		assert(BaseFormat!"q".size() == 8);
-		assert(BaseFormat!"4q".size() == 32);
-		assert(BaseFormat!"Q".size() == 8);
-		assert(BaseFormat!"4Q".size() == 32);
+		assert(test_size!"10s"() == 10);
+		assert(test_size!"b"() == 1);
+		assert(test_size!"4b"() == 4);
+		assert(test_size!"B"() == 1);
+		assert(test_size!"4B"() == 4);
+		assert(test_size!"h"() == 2);
+		assert(test_size!"4h"() == 8);
+		assert(test_size!"H"() == 2);
+		assert(test_size!"4H"() == 8);
+		assert(test_size!"i"() == 4);
+		assert(test_size!"4i"() == 16);
+		assert(test_size!"I"() == 4);
+		assert(test_size!"4I"() == 16);
+		assert(test_size!"q"() == 8);
+		assert(test_size!"4q"() == 32);
+		assert(test_size!"Q"() == 8);
+		assert(test_size!"4Q"() == 32);
 	}
 }