diff --git a/ts/deckoptions/BUILD.bazel b/ts/deckoptions/BUILD.bazel
index d88bd91a3..688733c84 100644
--- a/ts/deckoptions/BUILD.bazel
+++ b/ts/deckoptions/BUILD.bazel
@@ -134,6 +134,7 @@ svelte_check(
         "*.svelte",
     ]) + [
         "//ts/sass:button_mixins_lib",
+        "//ts/sass:night_mode_lib",
         "//ts/sass/bootstrap",
         "@npm//@types/bootstrap",
         "@npm//@types/lodash-es",
diff --git a/ts/sass/BUILD.bazel b/ts/sass/BUILD.bazel
index 9c61c0b79..947413cd9 100644
--- a/ts/sass/BUILD.bazel
+++ b/ts/sass/BUILD.bazel
@@ -53,6 +53,14 @@ sass_library(
     visibility = ["//visibility:public"],
 )
 
+sass_library(
+    name = "night_mode_lib",
+    srcs = [
+        "night_mode.scss",
+    ],
+    visibility = ["//visibility:public"],
+)
+
 exports_files(
     ["_vars.scss"],
     visibility = ["//visibility:public"],
diff --git a/ts/sass/night-mode.scss b/ts/sass/night_mode.scss
similarity index 100%
rename from ts/sass/night-mode.scss
rename to ts/sass/night_mode.scss