diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c03ec8e..bb8e3ce 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -52,15 +52,15 @@ jobs:
         with:
           postgres-version: 14
       - run: |
+          cpan IPC::Run
           call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
           nmake /NOLOGO /F Makefile.win
           nmake /NOLOGO /F Makefile.win install
-          nmake /NOLOGO /F Makefile.win installcheck
           curl -Ls -o REL_14_5.tar.gz https://github.com/postgres/postgres/archive/refs/tags/REL_14_5.tar.gz
           7z x REL_14_5.tar.gz
           7z x REL_14_5.tar
           ls -R .
           set PROVE=prove
-          set PROVE_FLAGS="-I .\postgres-REL_14_5\src\test\perl"
+          set PROVE_FLAGS="-I ./postgres-REL_14_5/src/test/perl"
           nmake /NOLOGO /F Makefile.win prove_installcheck
         shell: cmd
diff --git a/Makefile.win b/Makefile.win
index c229e04..42b0cb7 100644
--- a/Makefile.win
+++ b/Makefile.win
@@ -59,4 +59,4 @@ prove_installcheck:
 	rm -rf tmp_check
 	set PGPORT=65432
 	set PG_REGRESS="$(BINDIR)\pg_regress"
-	$(PROVE) $(PG_PROVE_FLAGS) $(PROVE_FLAGS) test\t\*.pl
+	$(PROVE) $(PG_PROVE_FLAGS) $(PROVE_FLAGS) test/t/*.pl