diff --git a/gm/arcofzorro.cpp b/gm/arcofzorro.cpp
index 792f7da..4c9b53f 100644
--- a/gm/arcofzorro.cpp
+++ b/gm/arcofzorro.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "gm.h"
+#include "sk_tool_utils.h"
 #include "SkRandom.h"
 
 namespace skiagm {