diff --git a/patterns/fs.hexpat b/patterns/fs.hexpat
index 0e3c7fc3..bed31018 100644
--- a/patterns/fs.hexpat
+++ b/patterns/fs.hexpat
@@ -2,6 +2,7 @@
 #pragma description Drive File System
 
 import std.io;
+import std.core;
 
 struct DiskTimeStamp {
 	u8 seconds, minutes, hours;
@@ -52,7 +53,7 @@ namespace fat32 {
 		lastLogical : 1;
 		padding : 1;
 		number : 5;
-	} [[bitfield_order(BitfieldOrder::MostToLeastSignificant, 8)]];
+	} [[bitfield_order(std::core::BitfieldOrder::MostToLeastSignificant, 8)]];
 
 	enum EntryStatus : u8 {
 		Regular = 0x00,
@@ -73,7 +74,7 @@ namespace fat32 {
 		subdirectory : 1;
 		archive : 1;
 		padding : 2;
-	} [[bitfield_order(BitfieldOrder::LeastToMostSignificant, 8)]];
+	} [[bitfield_order(std::core::BitfieldOrder::LeastToMostSignificant, 8)]];
 
 	struct DirEntry {
 		char fileName[8];
diff --git a/tests/patterns/test_data/fs.hexpat.img b/tests/patterns/test_data/fs.hexpat.img
new file mode 100644
index 00000000..79d6f0c3
Binary files /dev/null and b/tests/patterns/test_data/fs.hexpat.img differ