diff --git a/src/net/cert/internal/trust_store_chrome.h b/src/net/cert/internal/trust_store_chrome.h
index ebd0debf7e..0cabcd32b2 100644
--- a/src/net/cert/internal/trust_store_chrome.h
+++ b/src/net/cert/internal/trust_store_chrome.h
@@ -9,9 +9,13 @@
 #include "net/base/net_export.h"
 #include "net/cert/pki/trust_store.h"
 #include "net/cert/pki/trust_store_in_memory.h"
-#include "net/cert/root_store_proto_lite/root_store.pb.h"
 #include "third_party/abseil-cpp/absl/types/optional.h"
 
+// Forward declares this so root_store.pb.h would not be a public dependency.
+namespace chrome_root_store {
+class RootStore;
+}
+
 namespace net {
 
 struct ChromeRootCertInfo {