diff --git a/src/rev.cpp.in b/src/rev.cpp.in
--- a/src/rev.cpp.in
+++ b/src/rev.cpp.in
@@ -48,6 +48,11 @@ const char _openttd_revision[] = "!!VERS
 const char _openttd_build_date[] = __DATE__ " " __TIME__;
 
 /**
+ * The git revision hash of this version.
+ */
+const char _openttd_revision_hash[] = "!!GITHASH!!";
+
+/**
  * Let us know if current build was modified. This detection
  * works even in the case when revision string is overridden by
  * --revision argument.