diff --git a/pkgs/development/compilers/ghc/8.2.2.nix b/pkgs/development/compilers/ghc/8.2.2.nix
index 8c3012f881c..b548b05339e 100644
--- a/pkgs/development/compilers/ghc/8.2.2.nix
+++ b/pkgs/development/compilers/ghc/8.2.2.nix
@@ -88,8 +88,7 @@ stdenv.mkDerivation (rec {
     sha256 = "1z05vkpaj54xdypmaml50hgsdpw29dhbs2r7magx0cm199iw73mv";
   };
 
-  # https://ghc.haskell.org/trac/ghc/ticket/15449
-  enableParallelBuilding = !buildPlatform.isAarch64;
+  enableParallelBuilding = true;
 
   outputs = [ "out" "doc" ];
 
diff --git a/pkgs/development/compilers/ghc/8.4.3.nix b/pkgs/development/compilers/ghc/8.4.3.nix
index 7cd7494df05..e43f9a57d0a 100644
--- a/pkgs/development/compilers/ghc/8.4.3.nix
+++ b/pkgs/development/compilers/ghc/8.4.3.nix
@@ -90,8 +90,7 @@ stdenv.mkDerivation (rec {
     sha256 = "1mk046vb561j75saz05rghhbkps46ym5aci4264dwc2qk3dayixf";
   };
 
-  # https://ghc.haskell.org/trac/ghc/ticket/15449
-  enableParallelBuilding = !buildPlatform.isAarch64;
+  enableParallelBuilding = true;
 
   outputs = [ "out" "doc" ];
 
diff --git a/pkgs/development/compilers/ghc/8.6.1.nix b/pkgs/development/compilers/ghc/8.6.1.nix
index a2be9d25571..62ea39791b9 100644
--- a/pkgs/development/compilers/ghc/8.6.1.nix
+++ b/pkgs/development/compilers/ghc/8.6.1.nix
@@ -86,8 +86,7 @@ stdenv.mkDerivation (rec {
     sha256 = "0dkh7idgrqr567fq94a0f5x3w0r4cm2ydn51nb5wfisw3rnw499c";
   };
 
-  # https://ghc.haskell.org/trac/ghc/ticket/15449
-  enableParallelBuilding = !buildPlatform.isAarch64;
+  enableParallelBuilding = true;
 
   outputs = [ "out" "doc" ];