diff --git a/src/citron/updater/updater_service.h b/src/citron/updater/updater_service.h
index edd912fa7..0638718bf 100644
--- a/src/citron/updater/updater_service.h
+++ b/src/citron/updater/updater_service.h
@@ -15,6 +15,8 @@ class QNetworkAccessManager;
 
 namespace Updater {
 
+    std::string ExtractCommitHash(const std::string& version_string);
+
     struct DownloadOption {
         std::string name;
         std::string url;