diff --git a/pkgs/development/compilers/gcc-4.3/default.nix b/pkgs/development/compilers/gcc-4.3/default.nix
index b9d0d9bff5d..57fc0f805c4 100644
--- a/pkgs/development/compilers/gcc-4.3/default.nix
+++ b/pkgs/development/compilers/gcc-4.3/default.nix
@@ -127,7 +127,8 @@ stdenv.mkDerivation ({
   passthru = { inherit langC langCC langFortran langVhdl langTreelang
       enableMultilib; };
 
-  enableParallelBuilding = true;
+  # ghdl does not build fine with parallel building
+  enableParallelBuilding = if langVhdl then false else true;
 
   meta = {
     homepage = "http://gcc.gnu.org/";
diff --git a/pkgs/development/compilers/gcc-4.4/default.nix b/pkgs/development/compilers/gcc-4.4/default.nix
index bc9c2c89e1d..6c2897c56c4 100644
--- a/pkgs/development/compilers/gcc-4.4/default.nix
+++ b/pkgs/development/compilers/gcc-4.4/default.nix
@@ -247,7 +247,8 @@ stdenv.mkDerivation ({
   passthru = { inherit langC langCC langAda langFortran langTreelang langVhdl
       enableMultilib version; };
 
-  enableParallelBuilding = true;
+  # ghdl does not build fine with parallel building
+  enableParallelBuilding = if langVhdl then false else true;
 
   meta = {
     homepage = http://gcc.gnu.org/;