diff --git a/src/chocolatey.resources/helpers/functions/Get-CheckSumValid.ps1 b/src/chocolatey.resources/helpers/functions/Get-CheckSumValid.ps1
index f71df1c10a..8dfb96e62f 100644
--- a/src/chocolatey.resources/helpers/functions/Get-CheckSumValid.ps1
+++ b/src/chocolatey.resources/helpers/functions/Get-CheckSumValid.ps1
@@ -20,6 +20,10 @@ param(
   [string] $checksumType = 'md5'
 )
   Write-Debug "Running 'Get-ChecksumValid' with file:`'$file`', checksum: `'$checksum`', checksumType: `'$checksumType`'";
+  if ($env:chocolateyIgnoreChecksums -eq 'true') { 
+	Write-Warning "Ignoring checksums due to feature checksumFiles = false or config ignoreChecksums = true."
+	return 
+  }
   if ($checksum -eq '' -or $checksum -eq $null) { return }
 
   if (!([System.IO.File]::Exists($file))) { throw "Unable to checksum a file that doesn't exist - Could not find file `'$file`'" }
diff --git a/src/chocolatey/infrastructure.app/commands/ChocolateyInstallCommand.cs b/src/chocolatey/infrastructure.app/commands/ChocolateyInstallCommand.cs
index c85ff210aa..8c7539a5c0 100644
--- a/src/chocolatey/infrastructure.app/commands/ChocolateyInstallCommand.cs
+++ b/src/chocolatey/infrastructure.app/commands/ChocolateyInstallCommand.cs
@@ -83,6 +83,12 @@ public void configure_argument_parser(OptionSet optionSet, ChocolateyConfigurati
                 .Add("p=|password=",
                      "Password - the user's password to the source. Defaults to empty.",
                      option => configuration.SourceCommand.Password = option.remove_surrounding_quotes())
+                .Add("ignorechecksums|ignore-checksums",
+                      "IgnoreChecksums - Ignore checksums provided by the package",
+                      option =>
+                      {
+                          if (option != null) configuration.Features.CheckSumFiles = false;
+                      })
                 ;
 
             //todo: Checksum / ChecksumType defaults to md5 / package name can be a url / installertype
diff --git a/src/chocolatey/infrastructure.app/commands/ChocolateyUpgradeCommand.cs b/src/chocolatey/infrastructure.app/commands/ChocolateyUpgradeCommand.cs
index ac76ae8392..a44c72e233 100644
--- a/src/chocolatey/infrastructure.app/commands/ChocolateyUpgradeCommand.cs
+++ b/src/chocolatey/infrastructure.app/commands/ChocolateyUpgradeCommand.cs
@@ -88,6 +88,12 @@ public virtual void configure_argument_parser(OptionSet optionSet, ChocolateyCon
                 .Add("p=|password=",
                      "Password - the user's password to the source. Defaults to empty.",
                      option => configuration.SourceCommand.Password = option.remove_surrounding_quotes())
+                .Add("ignorechecksums|ignore-checksums",
+                      "IgnoreChecksums - Ignore checksums provided by the package",
+                      option =>
+                      {
+                        if (option != null) configuration.Features.CheckSumFiles = false;
+                      })
                 ;
         }
 
diff --git a/src/chocolatey/infrastructure.app/services/PowershellService.cs b/src/chocolatey/infrastructure.app/services/PowershellService.cs
index 44d3937686..6df127fa7a 100644
--- a/src/chocolatey/infrastructure.app/services/PowershellService.cs
+++ b/src/chocolatey/infrastructure.app/services/PowershellService.cs
@@ -208,6 +208,10 @@ public bool run_action(ChocolateyConfiguration configuration, PackageResult pack
                 if (configuration.Verbose)
                 {
                     Environment.SetEnvironmentVariable("ChocolateyEnvironmentVerbose", "true");
+                } 
+                if (!configuration.Features.CheckSumFiles)
+                {
+                    Environment.SetEnvironmentVariable("ChocolateyIgnoreChecksums", "true");
                 }
                 //todo:if (configuration.NoOutput)
                 //{