diff --git a/verilog/tools/project/BUILD b/verilog/tools/project/BUILD
index 532fb8316..cfbac9d3e 100644
--- a/verilog/tools/project/BUILD
+++ b/verilog/tools/project/BUILD
@@ -14,6 +14,7 @@ cc_binary(
         "//common/util:subcommand",
         "//verilog/analysis:symbol_table",
         "//verilog/analysis:verilog_project",
+        "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/flags:usage",
         "@com_google_absl//absl/status",
         "@com_google_absl//absl/strings",
diff --git a/verilog/tools/project/project_tool.cc b/verilog/tools/project/project_tool.cc
index 978c3b6aa..4abf42fbe 100644
--- a/verilog/tools/project/project_tool.cc
+++ b/verilog/tools/project/project_tool.cc
@@ -16,6 +16,7 @@
 #include <iostream>
 #include <string>
 
+#include "absl/flags/flag.h"
 #include "absl/flags/usage.h"
 #include "absl/status/status.h"
 #include "absl/strings/str_cat.h"