diff --git a/pkgs/os-specific/linux/nvidia-x11/builder.sh b/pkgs/os-specific/linux/nvidia-x11/builder.sh
index 51144bc10519..06ab334e3071 100755
--- a/pkgs/os-specific/linux/nvidia-x11/builder.sh
+++ b/pkgs/os-specific/linux/nvidia-x11/builder.sh
@@ -74,9 +74,9 @@ installPhase() {
         mkdir -p $out/bin
 
         for i in nvidia-settings nvidia-smi nvidia-xconfig; do
-	    cp $i $out/bin/$i
-	    patchelf --interpreter "$(cat $NIX_GCC/nix-support/dynamic-linker)" \
-	        --set-rpath $out/lib:$programPath:$glPath $out/bin/$i
+            cp $i $out/bin/$i
+            patchelf --interpreter "$(cat $NIX_GCC/nix-support/dynamic-linker)" \
+                --set-rpath $out/lib:$programPath:$glPath $out/bin/$i
         done
 
         # Header files etc.
@@ -96,6 +96,10 @@ installPhase() {
         substituteInPlace $out/share/applications/nvidia-settings.desktop \
             --replace '__UTILS_PATH__' $out/bin \
             --replace '__PIXMAP_PATH__' $out/share/pixmaps
+
+        # Test a bit.
+        $out/bin/nvidia-settings --version
+        $out/bin/nvidia-smi --help > /dev/null
     fi
 }
 
diff --git a/pkgs/os-specific/linux/nvidia-x11/default.nix b/pkgs/os-specific/linux/nvidia-x11/default.nix
index 2afbf12097cd..0c0f6ecc71ee 100644
--- a/pkgs/os-specific/linux/nvidia-x11/default.nix
+++ b/pkgs/os-specific/linux/nvidia-x11/default.nix
@@ -12,7 +12,7 @@ assert (!libsOnly) -> kernel != null;
 
 let
 
-  versionNumber = "331.67";
+  versionNumber = "331.79";
 
 in
 
@@ -25,12 +25,12 @@ stdenv.mkDerivation {
     if stdenv.system == "i686-linux" then
       fetchurl {
         url = "http://us.download.nvidia.com/XFree86/Linux-x86/${versionNumber}/NVIDIA-Linux-x86-${versionNumber}.run";
-        sha256 = "1imc66yxnm01i58xwqrwqc612h0rhdz8x170hqr2pjyk99bllsv9";
+        sha256 = "0dl6gj1k6rz7bzyflfgi8y4489bxv03gfcni7zjzy440xjm3sk9l";
       }
     else if stdenv.system == "x86_64-linux" then
       fetchurl {
         url = "http://us.download.nvidia.com/XFree86/Linux-x86_64/${versionNumber}/NVIDIA-Linux-x86_64-${versionNumber}-no-compat32.run";
-        sha256 = "0qxd4jd25ymcr6w97f71kfn549x6wgg4g3vixd3sqlczknn85f47";
+        sha256 = "14mwxz12kd5znnrmwia4qk35sd7xpr6cgpxs1xzjwmjgvz6gc71v";
       }
     else throw "nvidia-x11 does not support platform ${stdenv.system}";