diff --git a/tools/adev-patches/add-global-styles.patch b/tools/adev-patches/add-global-styles.patch
index f7854f7d54..6cbcec6f1c 100644
--- a/tools/adev-patches/add-global-styles.patch
+++ b/tools/adev-patches/add-global-styles.patch
@@ -8,7 +8,7 @@ index 2c83a2ad4a..9d9b28112a 100644
  @include xterm.xterm();
 +// adev-ja overrides
 +
-+docs-viewer {
++.docs-viewer {
 +    // `balance` is not good for Japanese headings.
 +    h1,
 +    h2,