diff --git a/reactos/include/defines.h b/reactos/include/defines.h
index 447ead77f52..4efbc97f542 100644
--- a/reactos/include/defines.h
+++ b/reactos/include/defines.h
@@ -2319,6 +2319,7 @@ extern "C" {
 #define EVENTLOG_BACKWARDS_READ	(8)
 #define EVENTLOG_SEEK_READ	(2)
 #define EVENTLOG_SEQUENTIAL_READ	(1)
+#define EVENTLOG_SUCCESS	(0)
 #define EVENTLOG_ERROR_TYPE	(1)
 #define EVENTLOG_WARNING_TYPE	(2)
 #define EVENTLOG_INFORMATION_TYPE	(4)