diff --git a/gin/gin_features.h b/gin/gin_features.h
index 6be95b01..34ba3cc 100644
--- a/gin/gin_features.h
+++ b/gin/gin_features.h
@@ -49,6 +49,7 @@
 GIN_EXPORT BASE_DECLARE_FEATURE(kJavaScriptChangeArrayByCopy);
 GIN_EXPORT BASE_DECLARE_FEATURE(kJavaScriptRabGsab);
 GIN_EXPORT BASE_DECLARE_FEATURE(kJavaScriptStringIsWellFormed);
+GIN_EXPORT BASE_DECLARE_FEATURE(kJavaScriptRegExpUnicodeSets);
 GIN_EXPORT BASE_DECLARE_FEATURE(kWebAssemblyTailCall);
 
 }  // namespace features