diff --git a/build.psm1 b/build.psm1
index 62397f6f4..ad3891a66 100644
--- a/build.psm1
+++ b/build.psm1
@@ -557,13 +557,14 @@ function Start-PSPester {
         [string]$Path = "$PSScriptRoot/test/powershell",
         [switch]$ThrowOnFailure,
         [switch]$FullCLR,
-        [string]$binDir = (Split-Path (New-PSOptions -FullCLR:$FullCLR).Output) 
+        [string]$binDir = (Split-Path (New-PSOptions -FullCLR:$FullCLR).Output),
+        [string]$powershell = (Join-Path $binDir 'powershell'),
+        [string]$Pester = ([IO.Path]::Combine($binDir, "Modules", "Pester"))
     )
 
     Write-Verbose "Running pester tests at '$path' with tag '$($Tag -join ''', ''')' and ExcludeTag '$($ExcludeTag -join ''', ''')'" -Verbose
     # All concatenated commands/arguments are suffixed with the delimiter (space)
     $Command = ""
-    $powershell = Join-Path $binDir 'powershell'
 
     # Windows needs the execution policy adjusted
     if ($IsWindows) {
@@ -571,10 +572,9 @@ function Start-PSPester {
     }
     $startParams = @{binDir=$binDir}
 
-    $PesterModule = [IO.Path]::Combine($binDir, "Modules", "Pester")
     if(!$FullCLR)
     {
-        $Command += "Import-Module '$PesterModule'; "
+        $Command += "Import-Module '$Pester'; "
     }
     $Command += "Invoke-Pester "
 
diff --git a/docker/launch.sh b/docker/launch.sh
index 00558cc64..022c60f25 100755
--- a/docker/launch.sh
+++ b/docker/launch.sh
@@ -27,13 +27,13 @@ for build in $BUILDS; do
         image="$build/$distro"
         if [[ "$TEST" -eq 1 ]]; then
             echo "Testing $image"
-            command="cd PowerShell; Import-Module ./build.psm1; Install-Dotnet -NoSudo; Start-PSPester"
+            command="cd PowerShell; Import-Module ./build.psm1; Install-Dotnet -NoSudo; Start-PSPester -powershell powershell -Pester ./src/Modules/Shared/Pester"
             # clone repo for stable images because it's not already done
             if [[ "$build" = stable ]]; then
                 command="git clone --recursive https://github.com/$FORK/PowerShell -b $BRANCH; $command"
             fi
             # run Pester tests inside container
-            docker run --rm -it powershell/powershell:$build-$distro powershell -c "$command"
+            docker run --rm -it powershell/powershell:$build-$distro -c "$command"
         else
             echo "Building $image"
             # copy the common script because it lives outside the docker build context