diff --git a/third_party/gerrit/default.nix b/third_party/gerrit/default.nix
index de2fb7157..1db37afed 100644
--- a/third_party/gerrit/default.nix
+++ b/third_party/gerrit/default.nix
@@ -39,7 +39,10 @@ pkgs.buildBazelPackage {
     sha256 = "1xrckiqc2l07dib22rn6iicgvph8iyxjrzr15bs5x6jdg9cic1s8";
     fetchSubmodules = true;
   };
-  patches = [ ./use_detzip.patch ];
+  patches = [
+    ./use_detzip.patch
+    ./syntax_highlight_nix.patch
+  ];
 
   bazelTarget = "release";
   inherit bazel;
diff --git a/third_party/gerrit/syntax_highlight_nix.patch b/third_party/gerrit/syntax_highlight_nix.patch
new file mode 100644
index 000000000..2a7791c75
--- /dev/null
+++ b/third_party/gerrit/syntax_highlight_nix.patch
@@ -0,0 +1,12 @@
+diff --git a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js
+index 1a0bbd9f50..0f2786a911 100644
+--- a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js
++++ b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js
+@@ -99,6 +99,7 @@ const LANGUAGE_MAP = {
+   'text/x-vhdl': 'vhdl',
+   'text/x-yaml': 'yaml',
+   'text/vbscript': 'vbscript',
++  'application/x-mix-transfer': 'nix',
+ };
+ const ASYNC_DELAY = 10;
+