diff --git a/pkgs/applications/networking/browsers/chromium/common.nix b/pkgs/applications/networking/browsers/chromium/common.nix
index 9711b743c937..e485758c50e5 100644
--- a/pkgs/applications/networking/browsers/chromium/common.nix
+++ b/pkgs/applications/networking/browsers/chromium/common.nix
@@ -320,7 +320,7 @@ let
 
     buildPhase = let
       buildCommand = target: ''
-        ninja -C "${buildPath}" "${target}"
+        ninja -C "${buildPath}" -j$NIX_BUILD_CORES -l$NIX_BUILD_CORES "${target}"
         (
           source chrome/installer/linux/common/installer.include
           PACKAGE=$packageName
diff --git a/pkgs/applications/networking/browsers/ungoogled-chromium/common.nix b/pkgs/applications/networking/browsers/ungoogled-chromium/common.nix
index 36e6256e33f8..3df8fb3afdb6 100644
--- a/pkgs/applications/networking/browsers/ungoogled-chromium/common.nix
+++ b/pkgs/applications/networking/browsers/ungoogled-chromium/common.nix
@@ -353,7 +353,7 @@ let
 
     buildPhase = let
       buildCommand = target: ''
-        ninja -C "${buildPath}" "${target}"
+        ninja -C "${buildPath}" -j$NIX_BUILD_CORES -l$NIX_BUILD_CORES "${target}"
         (
           source chrome/installer/linux/common/installer.include
           PACKAGE=$packageName