diff --git a/pkgs/development/tools/electron/common.nix b/pkgs/development/tools/electron/common.nix
index 3b3fbf923cb8..bedef826ea5e 100644
--- a/pkgs/development/tools/electron/common.nix
+++ b/pkgs/development/tools/electron/common.nix
@@ -140,6 +140,15 @@ in
         url = "https://github.com/chromium/chromium/commit/6aae0e2353c857d98980ff677bf304288d7c58de.patch";
         hash = "sha256-Dd38c/0hiH+PbGPJhhEFuW6kUR45A36XZqOVExoxlhM=";
       })
+    ]
+    ++ lib.optionals (lib.versionOlder info.version "38") [
+      # Fix build with LLVM 21+
+      # https://chromium-review.googlesource.com/c/chromium/src/+/6633292
+      (fetchpatch {
+        name = "Dont-return-an-enum-from-EnumSizeTraits-Count.patch";
+        url = "https://github.com/chromium/chromium/commit/b0ff8c3b258a8816c05bdebf472dbba719d3c491.patch";
+        hash = "sha256-YIWcsCj5w0jUd7D67hsuk0ljTA/IbHwA6db3eK4ggUY=";
+      })
     ];
 
   npmRoot = "third_party/node";