diff --git a/pkgs/development/libraries/webkitgtk/default.nix b/pkgs/development/libraries/webkitgtk/default.nix
index 484b42af0acd..7e9717579080 100644
--- a/pkgs/development/libraries/webkitgtk/default.nix
+++ b/pkgs/development/libraries/webkitgtk/default.nix
@@ -76,6 +76,7 @@
   withLibsecret ? true,
   systemdSupport ? lib.meta.availableOn clangStdenv.hostPlatform systemd,
   testers,
+  fetchpatch,
 }:
 
 # https://webkitgtk.org/2024/10/04/webkitgtk-2.46.html recommends building with clang.
@@ -109,6 +110,15 @@ clangStdenv.mkDerivation (finalAttrs: {
       inherit (builtins) storeDir;
       inherit (addDriverRunpath) driverLink;
     })
+
+    # Workaround to fix cross-compilation for RiscV
+    # error: ‘toB3Type’ was not declared in this scope
+    # See: https://bugs.webkit.org/show_bug.cgi?id=271371
+    (fetchpatch {
+      url = "https://salsa.debian.org/webkit-team/webkit/-/raw/debian/2.44.1-1/debian/patches/fix-ftbfs-riscv64.patch";
+      hash = "sha256-MgaSpXq9l6KCLQdQyel6bQFHG53l3GY277WePpYXdjA=";
+      name = "fix_ftbfs_riscv64.patch";
+    })
   ];
 
   nativeBuildInputs = [