diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 029f181afe..14786fb028 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -151,6 +151,7 @@ jobs:
           if ($lastexitcode -ne 0) {
              throw "nmake exit code: $lastexitcode"
           }
+          setx /M PATH "$($env:path);c:\progra~1\tcl\bin"
 
       - name: build
         env:
@@ -202,6 +203,11 @@ jobs:
         working-directory: ./out
         run: |
           Get-ChildItem -Recurse
+          echo "|||||||||||||"
+          Get-ChildItem -Recurse c:\progra~1\tcl
+          echo "|||||||||||||"
+          echo $env:path
+          echo "|||||||||||||"
           tclsh86t TestTclSML.tcl
           if ($lastexitcode -ne 0) {
              throw "TestTclSML.tcl exit code: $lastexitcode"