diff --git a/pkgs/development/compilers/julia/1.0.nix b/pkgs/development/compilers/julia/1.0.nix
index 5b1a4674a88..d68f56faf2e 100644
--- a/pkgs/development/compilers/julia/1.0.nix
+++ b/pkgs/development/compilers/julia/1.0.nix
@@ -184,6 +184,8 @@ stdenv.mkDerivation rec {
     export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}
   '';
 
+  enableParallelBuilding = true;
+
   postInstall = ''
     # Symlink shared libraries from LD_LIBRARY_PATH into lib/julia,
     # as using a wrapper with LD_LIBRARY_PATH causes segmentation
diff --git a/pkgs/development/compilers/julia/1.5.nix b/pkgs/development/compilers/julia/1.5.nix
index b4c33faa44c..f32c55bf1e2 100644
--- a/pkgs/development/compilers/julia/1.5.nix
+++ b/pkgs/development/compilers/julia/1.5.nix
@@ -129,6 +129,8 @@ stdenv.mkDerivation rec {
     export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}
   '';
 
+  enableParallelBuilding = true;
+
   postInstall = ''
     # Symlink shared libraries from LD_LIBRARY_PATH into lib/julia,
     # as using a wrapper with LD_LIBRARY_PATH causes segmentation