diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 510144e..e5f6d64 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -35,4 +35,4 @@ jobs:
         brew install cpanm && cpanm IPC::Run
         wget -q https://github.com/postgres/postgres/archive/refs/tags/REL_14_5.tar.gz
         tar xf REL_14_5.tar.gz
-        make prove_installcheck PROVE=prove PERL5LIB="postgres-REL_14_5/src/test/perl:/Users/runner/perl5/lib/perl5"
+        make prove_installcheck PROVE=prove PROVE_FLAGS="-I ./postgres-REL_14_5/src/test/perl" PERL5LIB="/Users/runner/perl5/lib/perl5"