diff --git a/.github/workflows/test_functional.yml b/.github/workflows/test_functional.yml
index 7cfc19dd24c..caecc089379 100644
--- a/.github/workflows/test_functional.yml
+++ b/.github/workflows/test_functional.yml
@@ -119,12 +119,12 @@ jobs:
             "/usr/local/opt/gnu-sed/libexec/gnubin" \
             >> "${GITHUB_PATH}"
           echo \
-            "/usr/local/opt/grep/libexec/gnubin" \
+            "$(brew --prefix)/opt/grep/libexec/gnubin" \
             >> "${GITHUB_PATH}"
 
           # add coreutils to the bashrc too (for jobs)
           cat >> "${HOME}/.bashrc" <<__HERE__
-          PATH="/usr/local/opt/grep/libexec/gnubin:$(brew --prefix)/opt/coreutils/libexec/gnubin:/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"
+          PATH="$(brew --prefix)/opt/grep/libexec/gnubin:$(brew --prefix)/opt/coreutils/libexec/gnubin:/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"
           export PATH
           __HERE__