diff --git a/pkgs/development/compilers/ghcjs-ng/8.4/git.json b/pkgs/development/compilers/ghcjs-ng/8.4/git.json
index 49ff19529c6..b27c75bfe71 100644
--- a/pkgs/development/compilers/ghcjs-ng/8.4/git.json
+++ b/pkgs/development/compilers/ghcjs-ng/8.4/git.json
@@ -1,6 +1,6 @@
 {
   "url": "https://github.com/ghcjs/ghcjs",
-  "rev": "6770fa38621f55b7a947fc11c69f81b8ce8502cf",
-  "sha256": "0c0x0yylx14mrvzmbvkw6zbprriizk73hvz8iija8i8hwpff79vm",
+  "rev": "d20da90a4819faad1c6309a06363b34edac0374c",
+  "sha256": "0jmxgfm1zwg6xscjcaycfam7zss8ik4ql4ii5lpryh4h6cdhvkbr",
   "fetchSubmodules": true
 }