diff --git a/rostests/winetests/advapi32/security.c b/rostests/winetests/advapi32/security.c
index 42dff8f4b84..fbce2a6ab2e 100644
--- a/rostests/winetests/advapi32/security.c
+++ b/rostests/winetests/advapi32/security.c
@@ -2390,7 +2390,7 @@ static void test_PrivateObjectSecurity(void)
 {
     SECURITY_INFORMATION sec_info = OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION|DACL_SECURITY_INFORMATION|SACL_SECURITY_INFORMATION;
     SECURITY_DESCRIPTOR_CONTROL ctrl;
-    PSECURITY_DESCRIPTOR sec;
+    PSECURITY_DESCRIPTOR sec = NULL;
     DWORD dwDescSize;
     DWORD dwRevision;
     DWORD retSize;