diff --git a/pkgs/by-name/bt/btrfs-assistant/package.nix b/pkgs/by-name/bt/btrfs-assistant/package.nix
index 08b6df49b264..64be27f6899b 100644
--- a/pkgs/by-name/bt/btrfs-assistant/package.nix
+++ b/pkgs/by-name/bt/btrfs-assistant/package.nix
@@ -12,6 +12,7 @@
   util-linux,
   enableSnapper ? true,
   nix-update-script,
+  fetchpatch,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -25,6 +26,15 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-hFWYT+YIgnqBigpPkGdsLj6rcg4CjJffAyXlR23QP0Y=";
   };
 
+  patches = [
+    # Disable -Werror
+    # https://gitlab.com/btrfs-assistant/btrfs-assistant/-/issues/134
+    (fetchpatch {
+      url = "https://gitlab.com/btrfs-assistant/btrfs-assistant/-/commit/edc0a13bac5189a1a910f5adab01b2d5b60c76f6.diff";
+      hash = "sha256-kGyp5OaSGk4OvhtyNSygJEW+wAJksK8opxtLPbhA+10=";
+    })
+  ];
+
   nativeBuildInputs = [
     cmake
     git