diff --git a/dll/win32/syssetup/wizard.c b/dll/win32/syssetup/wizard.c
index bd5e6118301..d3aaf7c71f3 100644
--- a/dll/win32/syssetup/wizard.c
+++ b/dll/win32/syssetup/wizard.c
@@ -2661,7 +2661,7 @@ typedef DWORD(WINAPI *PFNREQUESTWIZARDPAGES)(PDWORD, HPROPSHEETPAGE *, PSETUPDAT
 VOID
 InstallWizard(VOID)
 {
-    PROPSHEETHEADER psh;
+    PROPSHEETHEADER psh = {0};
     HPROPSHEETPAGE *phpage = NULL;
     PROPSHEETPAGE psp = {0};
     UINT nPages = 0;