diff --git a/Cargo.lock b/Cargo.lock
index 390fe9d..66ccdee 100755
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -55,6 +55,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "bitfield-struct"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0baacb7d5b6e94369201d5807e086d3f36e2bd35057ca2c5a680af3737e35fa"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -404,27 +415,6 @@ dependencies = [
  "autocfg",
 ]
 
-[[package]]
-name = "modular-bitfield"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a53d79ba8304ac1c4f9eb3b9d281f21f7be9d4626f72ce7df4ad8fbde4f38a74"
-dependencies = [
- "modular-bitfield-impl",
- "static_assertions",
-]
-
-[[package]]
-name = "modular-bitfield-impl"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a7d5f7076603ebc68de2dc6a650ec331a062a13abaa346975be747bbfa4b789"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "num-traits"
 version = "0.2.15"
@@ -479,6 +469,7 @@ name = "physis"
 version = "0.1.0"
 dependencies = [
  "binrw",
+ "bitfield-struct",
  "bitflags",
  "crc",
  "criterion",
@@ -487,7 +478,6 @@ dependencies = [
  "hard-xml",
  "hmac-sha512",
  "libz-sys",
- "modular-bitfield",
  "paste",
  "serde",
  "serde_json",
@@ -645,12 +635,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ae1a47186c03a32177042e55dbc5fd5aee900b8e0069a8d70fba96a9375cd012"
 
-[[package]]
-name = "static_assertions"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
-
 [[package]]
 name = "syn"
 version = "1.0.102"
diff --git a/Cargo.toml b/Cargo.toml
index f6f6b01..363eba2 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,7 +35,7 @@ binrw = "0.10"
 libz-sys = { version = "1.1", default-features = false }
 
 # nice to have features rust is lacking at the moment
-modular-bitfield = "0.11"
+bitfield-struct = "0.1"
 paste = "1"
 
 # needed for half-float support which FFXIV uses in it's model data
diff --git a/src/index.rs b/src/index.rs
index 34cc953..5baee1c 100755
--- a/src/index.rs
+++ b/src/index.rs
@@ -1,6 +1,6 @@
 use binrw::binrw;
 use binrw::BinRead;
-use modular_bitfield::prelude::*;
+use bitfield_struct::bitfield;
 use std::io::SeekFrom;
 
 #[binrw]
@@ -31,13 +31,18 @@ pub struct SqPackIndexHeader {
     index_data_size: u32,
 }
 
-#[bitfield]
+#[bitfield(u32)]
 #[binrw]
-#[br(map = Self::from_bytes)]
+#[br(map = | x: u32 | Self::from(x))]
 pub struct IndexHashBitfield {
-    pub size: B1,
-    pub data_file_id: B3,
-    pub offset: B28,
+    #[bits(1)]
+    pub size: u32,
+
+    #[bits(3)]
+    pub data_file_id: u32,
+
+    #[bits(28)]
+    pub offset: u32,
 }
 
 #[binrw]