diff --git a/dlls/advapi32/security.c b/dlls/advapi32/security.c
index 67c410f84e8..822937770b3 100644
--- a/dlls/advapi32/security.c
+++ b/dlls/advapi32/security.c
@@ -1679,7 +1679,7 @@ LookupPrivilegeValueW( LPCWSTR lpSystemName, LPCWSTR lpName, PLUID lpLuid )
         SetLastError(ERROR_NO_SUCH_PRIVILEGE);
         return FALSE;
     }
-    for( i=SE_MIN_WELL_KNOWN_PRIVILEGE; i<SE_MAX_WELL_KNOWN_PRIVILEGE; i++ )
+    for( i=SE_MIN_WELL_KNOWN_PRIVILEGE; i<=SE_MAX_WELL_KNOWN_PRIVILEGE; i++ )
     {
         if( !WellKnownPrivNames[i] )
             continue;
diff --git a/dlls/advapi32/tests/security.c b/dlls/advapi32/tests/security.c
index 2d5894680f6..3d027779355 100644
--- a/dlls/advapi32/tests/security.c
+++ b/dlls/advapi32/tests/security.c
@@ -579,7 +579,7 @@ static void test_lookupPrivilegeName(void)
      "SeCreateTokenPrivilege (got %d, expected %d)\n", cchName,
      (int)strlen("SeCreateTokenPrivilege"));
     /* check known values */
-    for (i = SE_MIN_WELL_KNOWN_PRIVILEGE; i < SE_MAX_WELL_KNOWN_PRIVILEGE; i++)
+    for (i = SE_MIN_WELL_KNOWN_PRIVILEGE; i <= SE_MAX_WELL_KNOWN_PRIVILEGE; i++)
     {
         luid.LowPart = i;
         cchName = sizeof(buf);