diff --git a/reactos/include/ndk/rtlfuncs.h b/reactos/include/ndk/rtlfuncs.h
index bcc2e13e202..930caf5c87a 100644
--- a/reactos/include/ndk/rtlfuncs.h
+++ b/reactos/include/ndk/rtlfuncs.h
@@ -3050,7 +3050,7 @@ RtlTimeFieldsToTime(
 );
 
 NTSYSAPI
-VOID
+BOOLEAN
 NTAPI
 RtlTimeToSecondsSince1970(
     PLARGE_INTEGER Time,