diff --git a/ink/brush/brush_family_test.cc b/ink/brush/brush_family_test.cc
index 6e903d13..0aa7fea8 100644
--- a/ink/brush/brush_family_test.cc
+++ b/ink/brush/brush_family_test.cc
@@ -15,7 +15,6 @@
 #include "ink/brush/brush_family.h"
 
 #include <limits>
-#include <optional>
 #include <string>
 #include <utility>
 #include <vector>
diff --git a/ink/brush/brush_paint_test.cc b/ink/brush/brush_paint_test.cc
index 779285d0..f2227646 100644
--- a/ink/brush/brush_paint_test.cc
+++ b/ink/brush/brush_paint_test.cc
@@ -15,7 +15,6 @@
 #include "ink/brush/brush_paint.h"
 
 #include <limits>
-#include <optional>
 #include <string>
 
 #include "gmock/gmock.h"