diff --git a/pkgs/development/compilers/ghc/7.0.4.nix b/pkgs/development/compilers/ghc/7.0.4.nix
index cd9c0613ad84..9e61be7b47f4 100644
--- a/pkgs/development/compilers/ghc/7.0.4.nix
+++ b/pkgs/development/compilers/ghc/7.0.4.nix
@@ -13,8 +13,6 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ghc perl gmp ncurses ];
 
-  enableParallelBuilding = true;
-
   buildMK = ''
     libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-libraries="${gmp}/lib"
     libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-includes="${gmp}/include"
diff --git a/pkgs/development/compilers/ghc/7.2.2.nix b/pkgs/development/compilers/ghc/7.2.2.nix
index c8f0ace31770..778b47afde78 100644
--- a/pkgs/development/compilers/ghc/7.2.2.nix
+++ b/pkgs/development/compilers/ghc/7.2.2.nix
@@ -13,8 +13,6 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ghc perl gmp ncurses ];
 
-  enableParallelBuilding = true;
-
   buildMK = ''
     libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-libraries="${gmp}/lib"
     libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-includes="${gmp}/include"
diff --git a/pkgs/development/compilers/ghc/7.4.2.nix b/pkgs/development/compilers/ghc/7.4.2.nix
index 67ac4db097bc..4e4a5f6024ea 100644
--- a/pkgs/development/compilers/ghc/7.4.2.nix
+++ b/pkgs/development/compilers/ghc/7.4.2.nix
@@ -14,8 +14,6 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ghc perl gmp ncurses ];
 
-  enableParallelBuilding = true;
-
   buildMK = ''
     libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-libraries="${gmp}/lib"
     libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-includes="${gmp}/include"
diff --git a/pkgs/development/compilers/ghc/7.6.3.nix b/pkgs/development/compilers/ghc/7.6.3.nix
index e47dc4fc10eb..4eb6e425f354 100644
--- a/pkgs/development/compilers/ghc/7.6.3.nix
+++ b/pkgs/development/compilers/ghc/7.6.3.nix
@@ -36,8 +36,6 @@ in stdenv.mkDerivation rec {
     SRC_CC_OPTS += ${cFlags}
   '';
 
-  enableParallelBuilding = true;
-
   preConfigure = ''
     echo "${buildMK}" > mk/build.mk
     sed -i -e 's|-isysroot /Developer/SDKs/MacOSX10.5.sdk||' configure