diff --git a/bafe87d871399b58ce4a50592b980c990a3eac39.patch b/bafe87d871399b58ce4a50592b980c990a3eac39.patch
new file mode 100644
index 0000000..d90f3ef
--- /dev/null
+++ b/bafe87d871399b58ce4a50592b980c990a3eac39.patch
@@ -0,0 +1,25 @@
+From bafe87d871399b58ce4a50592b980c990a3eac39 Mon Sep 17 00:00:00 2001
+From: Bodigrim <andrew.lelechenko@gmail.com>
+Date: Thu, 9 May 2024 01:02:44 +0100
+Subject: [PATCH] Fix compilation on big-endian arches
+
+---
+ System/OsString/Data/ByteString/Short/Internal.hs | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/System/OsString/Data/ByteString/Short/Internal.hs b/System/OsString/Data/ByteString/Short/Internal.hs
+index fedc199..f7ddcd8 100644
+--- a/System/OsString/Data/ByteString/Short/Internal.hs
++++ b/System/OsString/Data/ByteString/Short/Internal.hs
+@@ -311,7 +311,11 @@ word16ToLE#, word16FromLE# :: Word16# -> Word16#
+ word16ToLE#, word16FromLE# :: Word# -> Word#
+ #endif
+ #ifdef WORDS_BIGENDIAN
++#if MIN_VERSION_base(4,16,0)
++word16ToLE# w = wordToWord16# (byteSwap16# (word16ToWord# w))
++#else
+ word16ToLE# = byteSwap16#
++#endif
+ #else
+ word16ToLE# w# = w#
+ #endif
diff --git a/ghc9.10.spec b/ghc9.10.spec
index 82ea7ee..cf43eec 100644
--- a/ghc9.10.spec
+++ b/ghc9.10.spec
@@ -107,6 +107,9 @@ Patch40: cabal-add-riscv64.patch
 # Upstream in >= 9.9.
 Patch41: https://gitlab.haskell.org/ghc/ghc/-/commit/dd38aca95ac25adc9888083669b32ff551151259.patch
 
+# libraries
+Patch100: https://github.com/haskell/os-string/commit/bafe87d871399b58ce4a50592b980c990a3eac39.patch
+
 # https://gitlab.haskell.org/ghc/ghc/-/wikis/platforms
 
 # fedora ghc has been bootstrapped on
@@ -433,6 +436,11 @@ rm libffi-tarballs/libffi-*.tar.gz
 %patch -P41 -p1 -b .orig
 %endif
 
+(
+cd libraries/os-string
+%patch -P100 -p1 -b .orig
+)
+
 # https://github.com/haskell/directory/pull/184
 rm libraries/directory/directory.buildinfo