Define the number of days after which a catch-up scan is forced
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Windows Server 2012, Windows 8 or Windows RT
Path in the GPO console
Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Scan Description
This policy setting allows you to define the number of consecutive scheduled scans that can be missed after which a catch-up scan will be forced. By default, the value of this setting is 2 consecutive scheduled scans. If you enable this setting, a catch-up scan will occur after the specified number consecutive missed scheduled scans. If you disable or do not configure this setting, a catch-up scan will occur after the 2 consecutive missed scheduled scans.
Registry
HKLM
Software\Policies\Microsoft\Windows Defender\Scan Value name: MissedScheduledScanCountBeforeCatchup
MDM / Intune (CSP)
./Device/Vendor/MSFT/Policy/Config/ADMX_MicrosoftDefenderAntivirus/Scan_MissedScheduledScanCountBeforeCatchup Microsoft Learn documentation Mapping data: Microsoft Learn (CC BY 4.0)
Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Define the number of days after which a catch-up scan is forced
; State: Enabled
; Supported on: At least Windows Server 2012, Windows 8 or Windows RT
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Scan]
"MissedScheduledScanCountBeforeCatchup"=dword:00000001
"MissedScheduledScanCountBeforeCatchup"=dword:00000002More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Define the number of days after which a catch-up scan is forced
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT
$path = 'HKLM:\Software\Policies\Microsoft\Windows Defender\Scan'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'MissedScheduledScanCountBeforeCatchup' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'MissedScheduledScanCountBeforeCatchup' -Value 2 -Type DWordIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/ADMX_MicrosoftDefenderAntivirus/Scan_MissedScheduledScanCountBeforeCatchup
Data type: String
Value:
<enabled/>
<data id="Scan_MissedScheduledScanCountBeforeCatchup" value="2"/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Define the number of days after which a catch-up scan is forced
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows Defender\Scan' -Name 'MissedScheduledScanCountBeforeCatchup' -Expected 1 -Kind DWord)
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows Defender\Scan' -Name 'MissedScheduledScanCountBeforeCatchup' -Expected 2 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Define the number of days after which a catch-up scan is forced
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT
$path = 'HKLM:\Software\Policies\Microsoft\Windows Defender\Scan'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'MissedScheduledScanCountBeforeCatchup' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'MissedScheduledScanCountBeforeCatchup' -Value 2 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Define the number of days after which a catch-up scan is forced
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Define the number of days after which a catch-up scan is forced
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows Defender\Scan' -Name 'MissedScheduledScanCountBeforeCatchup' -Expected 1 -Kind DWord)
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows Defender\Scan' -Name 'MissedScheduledScanCountBeforeCatchup' -Expected 2 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Define the number of days after which a catch-up scan is forced
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT
$path = 'HKLM:\Software\Policies\Microsoft\Windows Defender\Scan'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'MissedScheduledScanCountBeforeCatchup' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'MissedScheduledScanCountBeforeCatchup' -Value 2 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.