diff --git a/reactos/lib/advapi32/advapi32.def b/reactos/lib/advapi32/advapi32.def
index 1209f22496b..dfadfc87113 100644
--- a/reactos/lib/advapi32/advapi32.def
+++ b/reactos/lib/advapi32/advapi32.def
@@ -373,7 +373,7 @@ LsaGetUserName@8
 ;LsaLookupPrivilegeDisplayName@16
 ;LsaLookupPrivilegeName@12
 ;LsaLookupPrivilegeValue@12
-;LsaLookupSids@20
+LsaLookupSids@20
 LsaNtStatusToWinError@4
 ;LsaOpenAccount@16
 LsaOpenPolicy@16