diff --git a/scripts/azure-pipelines/test-modified-ports.ps1 b/scripts/azure-pipelines/test-modified-ports.ps1
index d0b542c57d..57f13a2b58 100755
--- a/scripts/azure-pipelines/test-modified-ports.ps1
+++ b/scripts/azure-pipelines/test-modified-ports.ps1
@@ -165,11 +165,20 @@ if (($BuildReason -eq 'PullRequest') -and -not $NoParentHashes)
     $parentHashesFile = Join-Path $ArtifactStagingDirectory 'parent-hashes.json'
     $parentHashes = @("--parent-hashes=$parentHashesFile")
     & git revert -n -m 1 HEAD | Out-Null
+    # The vcpkg.cmake toolchain file is not part of ABI hashing,
+    # but changes must trigger at least some testing.
+    Copy-Item "scripts/buildsystems/vcpkg.cmake" -Destination "scripts/test_ports/cmake"
+    Copy-Item "scripts/buildsystems/vcpkg.cmake" -Destination "scripts/test_ports/cmake-user"
     & "./vcpkg$executableExtension" ci $Triplet --dry-run --exclude=$skipList @hostArgs @commonArgs --no-binarycaching "--output-hashes=$parentHashesFile"
+
     Write-Host "Running CI using parent hashes"
     & git reset --hard HEAD
 }
 
+# The vcpkg.cmake toolchain file is not part of ABI hashing,
+# but changes must trigger at least some testing.
+Copy-Item "scripts/buildsystems/vcpkg.cmake" -Destination "scripts/test_ports/cmake"
+Copy-Item "scripts/buildsystems/vcpkg.cmake" -Destination "scripts/test_ports/cmake-user"
 & "./vcpkg$executableExtension" ci $Triplet --x-xunit=$xmlFile --exclude=$skipList --failure-logs=$failureLogs @hostArgs @commonArgs @cachingArgs @parentHashes
 
 $failureLogsEmpty = (-Not (Test-Path $failureLogs) -Or ((Get-ChildItem $failureLogs).count -eq 0))
diff --git a/scripts/buildsystems/vcpkg.cmake b/scripts/buildsystems/vcpkg.cmake
index 2bee6cbe86..138963133e 100644
--- a/scripts/buildsystems/vcpkg.cmake
+++ b/scripts/buildsystems/vcpkg.cmake
@@ -4,6 +4,8 @@ mark_as_advanced(CMAKE_TOOLCHAIN_FILE)
 # NOTE: to figure out what cmake versions are required for different things,
 # grep for `CMake 3`. All version requirement comments should follow that format.
 
+# Attention: Changes to this file do not affect ABI hashing.
+
 #[===[.md:
 # z_vcpkg_add_fatal_error
 Add a fatal error.