diff --git a/pkgs/development/haskell-modules/with-packages-wrapper.nix b/pkgs/development/haskell-modules/with-packages-wrapper.nix
index 22932eea665d..30035671a327 100644
--- a/pkgs/development/haskell-modules/with-packages-wrapper.nix
+++ b/pkgs/development/haskell-modules/with-packages-wrapper.nix
@@ -3,7 +3,7 @@
 , ignoreCollisions ? false, withLLVM ? false }:
 
 # This wrapper works only with GHC 6.12 or later.
-assert lib.versionOlder "6.12" ghc.version;
+assert lib.versionOlder "6.12" ghc.version || ghc.isGhcjs;
 
 # It's probably a good idea to include the library "ghc-paths" in the
 # compiler environment, because we have a specially patched version of