diff --git a/pkgs/development/compilers/ghcjs-ng/8.4/git.json b/pkgs/development/compilers/ghcjs-ng/8.4/git.json
index 2d4a7a42667..49ff19529c6 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": "c494a598d1e5b6d70ddcb97177dc4b6cc71f5bd0",
-  "sha256": "1gpn1y3m2gk2x4anfh11p4cp49blabj761wicawvkw0w9bfhcfhn",
+  "rev": "6770fa38621f55b7a947fc11c69f81b8ce8502cf",
+  "sha256": "0c0x0yylx14mrvzmbvkw6zbprriizk73hvz8iija8i8hwpff79vm",
   "fetchSubmodules": true
 }