diff --git a/appveyor12.yml b/appveyor12.yml
index cf9feffae..13fa44334 100644
--- a/appveyor12.yml
+++ b/appveyor12.yml
@@ -44,7 +44,6 @@ environment:
 before_build:
 - nuget restore
 - ps: .\prebuild.ps1
-- ps: [System.Convert]::FromBase64String($env:CertificatePassword) | set-content "greenshot.pfx" -encoding byte
 - ps: $psw = ConvertTo-SecureString $env:CertificatePassword -AsPlainText
 - ps: Import-PfxCertificate -FilePath Greenshot.pfx -CertStoreLocation cert:\CurrentUser\My -Password $psw
 build:
diff --git a/prebuild.ps1 b/prebuild.ps1
index 60d3be684..0390a669c 100644
--- a/prebuild.ps1
+++ b/prebuild.ps1
@@ -44,3 +44,6 @@ Function FillCredentials {
 }
 
 FillCredentials
+
+# Write the certificate to a file
+[System.Convert]::FromBase64String($env:CertificatePassword) | set-content "greenshot.pfx" -encoding byte