diff --git a/regtests/0341_hpack/test.opt b/regtests/0341_hpack/test.opt
deleted file mode 100644
index 5cf5570fb..000000000
--- a/regtests/0341_hpack/test.opt
+++ /dev/null
@@ -1,2 +0,0 @@
-ppc-linux XFAIL Server crash; see eng/toolchain/aws#4.
-ppc64-linux XFAIL Server crash; see eng/toolchain/aws#4.
diff --git a/regtests/0344_http2_hello/test.opt b/regtests/0344_http2_hello/test.opt
deleted file mode 100644
index 5cf5570fb..000000000
--- a/regtests/0344_http2_hello/test.opt
+++ /dev/null
@@ -1,2 +0,0 @@
-ppc-linux XFAIL Server crash; see eng/toolchain/aws#4.
-ppc64-linux XFAIL Server crash; see eng/toolchain/aws#4.
diff --git a/regtests/0346_http2_post_attachments/test.opt b/regtests/0346_http2_post_attachments/test.opt
deleted file mode 100644
index 5cf5570fb..000000000
--- a/regtests/0346_http2_post_attachments/test.opt
+++ /dev/null
@@ -1,2 +0,0 @@
-ppc-linux XFAIL Server crash; see eng/toolchain/aws#4.
-ppc64-linux XFAIL Server crash; see eng/toolchain/aws#4.
diff --git a/regtests/0347_http2_post_connection/test.opt b/regtests/0347_http2_post_connection/test.opt
deleted file mode 100644
index 5cf5570fb..000000000
--- a/regtests/0347_http2_post_connection/test.opt
+++ /dev/null
@@ -1,2 +0,0 @@
-ppc-linux XFAIL Server crash; see eng/toolchain/aws#4.
-ppc64-linux XFAIL Server crash; see eng/toolchain/aws#4.
diff --git a/regtests/0348_http2_client_status/test.opt b/regtests/0348_http2_client_status/test.opt
deleted file mode 100644
index 5cf5570fb..000000000
--- a/regtests/0348_http2_client_status/test.opt
+++ /dev/null
@@ -1,2 +0,0 @@
-ppc-linux XFAIL Server crash; see eng/toolchain/aws#4.
-ppc64-linux XFAIL Server crash; see eng/toolchain/aws#4.
diff --git a/src/http2/aws-http2-hpack-huffman.adb b/src/http2/aws-http2-hpack-huffman.adb
index 508bca2a8..e0565a867 100644
--- a/src/http2/aws-http2-hpack-huffman.adb
+++ b/src/http2/aws-http2-hpack-huffman.adb
@@ -380,7 +380,6 @@ package body AWS.HTTP2.HPACK.Huffman is
 
       EOS    : constant Unsigned_32 := 16#fffffffa#;
 
-      type Byte_Bits is array (0 .. 7) of Bit with Pack;
       Iter    : Node_Access := Root;
       Padding : Natural := 0;
       Pad_0   : Boolean := False;
@@ -390,7 +389,6 @@ package body AWS.HTTP2.HPACK.Huffman is
       for K in Str'Range loop
          declare
             E    : constant Stream_Element := Str (K);
-            Bits : Byte_Bits with Size => 8, Address => E'Address;
             C    : Character;
          begin
             --  Keep last four bytes to check for EOS
@@ -406,7 +404,8 @@ package body AWS.HTTP2.HPACK.Huffman is
 
             for B in reverse 0 .. 7 loop
                declare
-                  Bit : constant Huffman.Bit := Bits (B);
+                  Bit : constant Huffman.Bit :=
+                          Huffman.Bit (Shift_Right (Unsigned_8 (E), B) and 1);
                begin
                   if Decode_Bit (Iter, Bit, C) then
                      I := I + 1;
diff --git a/src/http2/aws-http2-hpack.adb b/src/http2/aws-http2-hpack.adb
index 023bc712d..053d90cdd 100644
--- a/src/http2/aws-http2-hpack.adb
+++ b/src/http2/aws-http2-hpack.adb
@@ -28,6 +28,7 @@
 ------------------------------------------------------------------------------
 
 with Interfaces;
+with System;
 
 with AWS.HTTP2.Connection;
 with AWS.HTTP2.HPACK.Huffman;
@@ -93,6 +94,11 @@ package body AWS.HTTP2.HPACK is
       B41 at 0 range 0 .. 3;
    end record;
 
+   --  Pick an explicit bit indexing order for this record, otherwise
+   --  the position & ranges in the component clauses will be
+   --  interpreted differently depending on endianness.
+   for RFC_Byte'Bit_Order use System.Low_Order_First;
+
    B_II          : constant Bit2 := 2#01#;
    --  Incremental Indexing