diff --git a/gn/gn_to_bp_utils.py b/gn/gn_to_bp_utils.py
index 3cc91483b0..65456408cd 100644
--- a/gn/gn_to_bp_utils.py
+++ b/gn/gn_to_bp_utils.py
@@ -52,7 +52,6 @@ def CleanupCFlags(cflags):
     "-DSKIA_DLL",
     "-DSKIA_IMPLEMENTATION=1",
     "-DATRACE_TAG=ATRACE_TAG_VIEW",
-    "-DSK_SUPPORT_LEGACY_BLURMASKFILTER",
     "-DSK_PRINT_CODEC_MESSAGES",
   ])