diff --git a/src/codegen/mod.rs b/src/codegen/mod.rs
index ee4a9d4e78..c203795a62 100644
--- a/src/codegen/mod.rs
+++ b/src/codegen/mod.rs
@@ -913,20 +913,20 @@ fn flush_bitfields<'a, I>(ctx: &BindgenContext,
         .pub_()
         .build_ty(field_ty.clone());
 
+    let field_int_ty = match field_layout.size {
+        8 => quote_ty!(ctx.ext_cx(), u64),
+        4 => quote_ty!(ctx.ext_cx(), u32),
+        2 => quote_ty!(ctx.ext_cx(), u16),
+        1 => quote_ty!(ctx.ext_cx(), u8),
+        _ => return field
+    };
+
     for (name, offset, width, bitfield_ty, bitfield_layout) in bitfields {
         let prefix = ctx.trait_prefix();
         let getter_name = bitfield_getter_name(ctx, parent, name);
         let setter_name = bitfield_setter_name(ctx, parent, name);
         let field_ident = ctx.ext_cx().ident_of(field_name);
 
-        let field_int_ty = match field_layout.size {
-            8 => quote_ty!(ctx.ext_cx(), u64),
-            4 => quote_ty!(ctx.ext_cx(), u32),
-            2 => quote_ty!(ctx.ext_cx(), u16),
-            1 => quote_ty!(ctx.ext_cx(), u8),
-            _ => panic!("physical field containing bitfields should be sized \
-                         8, 4, 2, or 1 bytes")
-        };
         let bitfield_int_ty = BlobTyBuilder::new(bitfield_layout).build();
 
         let mask: usize = ((1usize << width) - 1usize) << offset;
diff --git a/tests/expectations/tests/bitfield-large.rs b/tests/expectations/tests/bitfield-large.rs
new file mode 100644
index 0000000000..d4fe96948a
--- /dev/null
+++ b/tests/expectations/tests/bitfield-large.rs
@@ -0,0 +1,32 @@
+/* automatically generated by rust-bindgen */
+
+
+#![allow(non_snake_case)]
+
+
+#[repr(C)]
+#[derive(Debug, Default, Copy)]
+pub struct HasBigBitfield {
+    pub _bitfield_1: [u8; 16usize],
+}
+#[test]
+fn bindgen_test_layout_HasBigBitfield() {
+    assert_eq!(::std::mem::size_of::<HasBigBitfield>() , 16usize , concat ! (
+               "Size of: " , stringify ! ( HasBigBitfield ) ));
+}
+impl Clone for HasBigBitfield {
+    fn clone(&self) -> Self { *self }
+}
+#[repr(C)]
+#[derive(Debug, Default, Copy)]
+pub struct HasTwoBigBitfields {
+    pub _bitfield_1: [u8; 16usize],
+}
+#[test]
+fn bindgen_test_layout_HasTwoBigBitfields() {
+    assert_eq!(::std::mem::size_of::<HasTwoBigBitfields>() , 16usize , concat
+               ! ( "Size of: " , stringify ! ( HasTwoBigBitfields ) ));
+}
+impl Clone for HasTwoBigBitfields {
+    fn clone(&self) -> Self { *self }
+}
diff --git a/tests/headers/bitfield-large.hpp b/tests/headers/bitfield-large.hpp
new file mode 100644
index 0000000000..2e34927929
--- /dev/null
+++ b/tests/headers/bitfield-large.hpp
@@ -0,0 +1,9 @@
+struct HasBigBitfield {
+  __int128 x : 128;
+};
+
+
+struct HasTwoBigBitfields {
+  __int128 x : 80;
+  __int128 y : 48;
+};